RikoteMaster/aqua-rat-mcqa huggingface dataset:
Question: A block of wood has dimensions 10cm x 10cm x 80cm. The block is painted red and then cut evenly at the 40 cm mark, parallel to the sides, to form two rectangular solids of equal volume. What percentage of the surface area of each of the new solids is not painted red?
A.5.6%
B.8.4%
C.11.2%
D.14.8%
Answer: A.5.6%
Explanation: The area of each half is 100+4(400)+100 = 1800
The area that is not painted is 100.
The fraction that is not painted is 100/1800 = 1/18 = 5.6%
The answer is A.
Question: Which of the following equations represents a line that is perpendicular to y=1/4*x+2?
A.y−2x=8
B.2x+4y=10
C.3y+6x=12
D.4y−8x=16
Answer: D.4y−8x=16
Explanation: For two lines to be perpendicular, the product of slopes should be equal to -1.
Slope of line 1 = 1/2
Slope of the line perpendicular to line 1 must be -2. Option C can be rewritten as y = -2x + 4 --> Slope = -2
Answer: D
Question: If a man can cover 15 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
A.196km
B.190km
C.200km
D.202.5km
Answer: D.202.5km
Explanation: 15 m/s = 15 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 15 * 18/5 * 15/4 km = 202.5 km.
Answer:D
Question: Car A travels at three times the average speed of car B. Car A started to travel at 12:00 o'clock, car B started to travel at 16:00 o'clock. What is the speed of car B (in Km/h) if the total distance that both cars traveled until 18:00 was 6000 Km?
A.10.
B.25.
C.300.
D.38.
Answer: C.300.
Explanation: Total distance= Distance travelled by A +Distance travelled by car B
Distance= speed*time
Distance of A= 3x * 6
Distance of B= x*2
(3x * 6) + (x*2) = 6000
x= 300 KM/hr
C is the answer
Question: If a * b = 2a - 3b + ab, then 3 * 5 + 5 * 3 is equal to :
A.22
B.37
C.38
D.398
Answer: A.22
Explanation: Explanation:
3 * 5 + 5 * 3 = (2 * 3 - 3 * 5 + 3 * 5) + ( 2 * 5 - 3 * 3 + 5 * 3)
= (6 + 10 - 9 + 15) = 22.
Answer: A) 22
Question: A water tank is one-fourth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 8 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
A.4 min. to empty
B.6 min. to full
C.10 min. to empty
D.9 min. to full
Answer: C.10 min. to empty
Explanation: Clearly, pipe B is faster than pipe A and so, the tank will be emptied.
Part to be emptied = 1/4
Part emptied by (A + B) in 1 minute = (1/8 - 1/10) = 1/40
1/40 : 1/4 :: 1 : x
x = (1/4 * 1 * 40) = 10 min.
So, the tank will be emptied in 10 min.
ANSWER:C
Question: The expression x#y denotes the product of the consecutive multiples of 3 between x and y, inclusive. What is the sum of the exponents in the prime factorization of 21#30?
A.10
B.11
C.12
D.13
Answer: C.12
Explanation: First, let's translate the expression 21#30, using the definition given:
21#30 = 21×24×27×30
We need the prime factorization of this product.
Let's factor out 3 from each multiple.
21#30 = 3^4(7×8×9×10)
Now let's replace each consecutive integer with its prime factorization:
21#30 = 3^4(7×2^3×3^2×(2×5))
Let's group the prime bases:
21#30 = 2^4×3^6×5×7
The sum of the exponents is 4 + 6 + 1 + 1 = 12
The answer is C.
Question: The average of five consecutive odd numbers is 51. What is the difference between the highest and lowest number?
A..8
B.9
C.6
D.5
Answer: A..8
Explanation: Explanation:
Let the numbers be x, x + 2, x + 4, x + 6 and x + 8.
Then, [x + (x + 2) + (x + 4) + (x + 6) + (x + 8)] / 5 = 51
5x + 20 = 255
x = 47
So, required difference = (47 + 8) – 47 = 8
ANSWER: A
Question: A, B, and C were to be paid in proportion to the part of work they did while working on the same piece of work. A and B individually can finish the piece of work in 12 days and 15 days respectively. They worked together for five days and then C completed the remaining work all alone. If $810 was the net sum to be paid for the entire work, what was the average daily wage of B?
A.$144
B.$90
C.$60
D.$54
Answer: D.$54
Explanation: The correct answer is D.
Question: Company A's workforce consists of 10 percent managers and 90 percent software engineers. Company B's workforce consists of 30 percent managers, 10 percent software engineers, and 60 percent support staff. The two companies merge, every employee stays with the resulting company, and no new employees are added. If the resulting companyís workforce consists of 25 percent managers, what percent of the workforce originated from Company A?
A.10%
B.20%
C.25%
D.50%
Answer: C.25%
Explanation: Let say Company A has x employes and B has y employees. Now they merge and total no of employees = x+y employees.
Per the question Company A's workforce consists of 10 percent managers and 90 percent software engineers. Company B's workforce consists of 30 percent managers, 10 percent software engineers, and 60 percent support staff. We translate it into equation as follows:
.1x + .3y = .25 (x+y)
=> x + 3y =2.5 (x+y)
=> .5y = 1.5x
=> y=3x.
Now we know total employee = x+y. we need to find %age of x in total (x+y) ie x/(x+y) X100%
=> x/(3x+x) [substitute y=3x] => x/4x X 100%
=> .25 X 100 % => 25%.
ANSWER:C
Question: A train 125 m long passes a man, running at 2 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is?
A.36
B.50
C.28
D.47
Answer: D.47
Explanation: Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec. [(25/2) * (18/5)] km/hr = 45 km/hr. Let the speed of the train be x km/hr. Then, relative speed = (x - 2) km/hr. x - 2 = 45 ==> x = 47 km/hr
Answer: D
Question: The decimal d is formed by writing in succession all the positive integers in increasing order after the decimal point; that is d = 0.123456789101112
What is the 100th digit of d to the right of decimal point ?
A.0
B.1
C.5
D.8
Answer: C.5
Explanation: Now, let's see first we have those single digit numbers that occupy 9 spaces
Then the next integers from 10 to 19 will be 10 of them that will occupy 2 places each hence 20
The next ones will be from 20 to 29, 10 of them again, 2 places each hence 20 and so on
...
Until we get to 50-59 which will be 10 integers again, 2 places each hence 20 digits.
Now the 100th digit will be in the 50-59 range taking into consideration the first 9 single digit integers.
We also know that the tenth digits is always in an even place while the units digit is in the odd place. Therefore, the 100th digit will be the tenth digit of the given range (50-59) thus 5
Answer is C
Question: Angelina walked 100 meters from her home to the grocery at a constant speed. She then walked 180 meters to the gym at double the speed. She spent 40 seconds less on her way from the grocery to the gym than on her way from home to the grocery. What was Angelina's speed, in meters per second, from the grocery to the gym?
A.2
B.3
C.0.5
D.6
Answer: C.0.5
Explanation: let the speed be X...
so time taken from home to grocery= 100/x..
the speed to gym = 2x..
so time taken = 180/2x=90/x..
its given 100/x-90/x=40..
10/x=40..
x=0.25m/secs..
so grocery to gym=2*0.25=0.5m/s...
Answer : C
Question: The sum of all the integers f such that -26 < f < 24 is
A.0
B.-2
C.-25
D.-49
Answer: D.-49
Explanation: Easy one -
-25, -24, -23,-22,...... -1,0, 1, 2...., 22, 23
Cancel everyhitng and we're left with - -25 and -24 f= -49.
D is the answer.
Question: Tough and Tricky questions: Arithmetic.
(54^2 + 54^2)/18^2 =
A.24
B.8
C.29
D.58
Answer: A.24
Explanation: Ans is 24
my approach was:
(54^2 + 54^2)/18^2 =54(54+54)/18*18
=54*108/18*18=3*6=24
A
Question: In a caravan, in addition to 50 hens there are 45 goats and 8 camels with some keepers. If the total number of feet be 224 more than the number of heads, find the number of keepers.
A.25
B.20
C.15
D.13
Answer: C.15
Explanation: Let the number of keepers be x then,
Total number of heads =(50 + 45 + 8 + x)= (103 + x).
Total number of feet = (45 + 8) x 4 + (50 + x) x 2 =(312 +2x).
(312 + 2x)-(103 + x) =224 ==> x =15.
Hence, number of keepers =15.
Answer C.
Question: Rich has 3 green, 2 red and 3 blue balls in a bag. He randomly picks 5 from the bag without replacement. What is the probability Q that of the 5 drawn balls, Rich has picked 1 red, 2 green, and 2 blue balls?
A.8/28
B.Q=9/28
C.Q=10/28
D.Q=10/18
Answer: B.Q=9/28
Explanation: (3c2*2c1*3c2)/8c5
=(3*2*3)/(8*7*6/3*2)
=18/56
=9/28
B
Question: Express a speed of 63 kmph in meters per second?
A.10 mps
B.14 mps
C.17.5 mps
D.19.4 mps
Answer: C.17.5 mps
Explanation: 63* 5/18 = 17.5 mps
Answer: C
Question: UBA Capital recently bought Brand new vehicles for office use. UBA capital only went for Toyota and Honda and bought less of Toyota than Honda at the ratio of 7:3. If 70% of the Toyota bought and 30% of the Honda bought were SUVÃ¢â‚¬â„¢s. How many SUVÃ¢â‚¬â„¢s did UBA capital buy in the aforementioned purchase?
A.76%
B.58%
C.68%
D.89%
Answer: B.58%
Explanation: let total no of Vehicles bought be 100, Toyota 70 and Honda 30, so total number of SUV's bought for Toyota and Honda respectively 70* 70/100=49 and 30* 30/100=9
so total 58 SUV's were bought out of 100 Vehicles bought..so required % is 58%
ANSWER:B
Question: A computer store offers employees a 10% discount off the retail price. If the store purchased a computer from the manufacturer for $1200 dollars and marked up the price 10% to the final retail price, how much would an employee save if he purchased the computer at the employee discount (10% off retail price) as opposed to the final retail price.
A.122
B.132
C.142
D.152
Answer: B.132
Explanation: Cost price=1200
Profit=10% =10% of 1200=120
selling price=CP+ Profit
SP=1320
a Discount of 10% to employees means 10% off on 1320
so 10% of 1320= 132
Ans B
Question: Machine A can do a certain job in 8 hours. Machine B can do the same job in 10 hours. Machine C can do the same job in 12 hours. All three machines start the job at 9:00 a.m. Machine A breaks down at 11:00 a.m., and the other two machines finish the job. Approximately what time T will the job be finished?
A.Noon
B.12:30 p.m.
C.1:00 p.m.
D.1:30 p.m.
Answer: C.1:00 p.m.
Explanation: Ans: C (1:00pm)
From 9:00-11:00c(2 hrs)
A can do 1/8 Job/hr. so in 2 hours he can do 1/4 job.
B can do 1/10 job/hr so in 2 hrs. he can do 1/5 Job.
C can do 1/12 job/hr so in 2 hours he can do 1/6 job.
Total = 1/4+1/5+1/6 = 37/60 Job
Now balance work needs to be done by B and C.
Balance Work= 23/60 Job
Combined rate of B and C = 1/10+1/12 = 11/60 job/hr.
So they will do 22/60 work in 2 hrs (approx. to the balance work of 23/60)
Hence the Job will be completed 2hrs. after 11:00 i.e. @ 1:00pm=T
Ans: C (1:00pm)
Question: If x and y are positive integers, and 4x^2=3y, then which of the following must be a multiple of 4?
I. x^2
II. y^2
III. xy
A.I only
B.II only
C.III only
D.I and II only
Answer: D.I and II only
Explanation: 4x^2 = 3y
since x,y are positive integers, x^2 = x*x is divisible by 3 -> x is divisible by 3 and y is divisible by x^2
-> x^2 and y is divisible by 9 -> y^2 is divisible by 9
(1),(2), and (3) must be true
Answer is D
Question: The radius of a circle is increased by 1%. Find how much % does its area increases?
A.2.21%
B.2.07%
C.2.08%
D.2.01%
Answer: D.2.01%
Explanation: r = 100 r = 101
r2 = 10000 r2 = 10201
10000 ---- 201
100 ---- ? => 2.01%
Answer:D
Question: Two cars P and Q start at the same time from A and B which are 120 km apart. If the two cars travel in opposite directions, they meet after one hour and if they travel in same direction (from A towards B), then P meets Q after 6 hours. What is the speed of car P?
A.22 km/hr
B.70 km/hr
C.77 km/hr
D.66 km/hr
Answer: B.70 km/hr
Explanation: Let their speed be x km/hr and y km/he respectively.
Then, 120/(x + y) = 1 => x + y = 120 --- (i)
Now, when they move in same direction:
(Distance traveled by P in 6 hrs) - (Distance traveled by Q in 6 hrs) = 120 km
6x - 6y = 120 => x - y = 20 --- (ii)
Sloving (i) and (ii), we get x = 70, y = 50
P's speed = 70 km/hr.
Answer:B
Question: A certain collage has total of 420 seniors each majoring in exactly one of six subjects. A minimum of 20 seniors major in each six subjects. If three quarter of the seniors major in one of four subjects, what is the greatest possible number of seniors majoring in one of the other two subjects?
A.100
B.80
C.75
D.60
Answer: A.100
Explanation: Answer is A.
Six majors are as follows: a + b + c + d + e + f
Each has at least 20 seniors: 20 + 20 + 20 + 20 + 20 + 20
4 of the majors have 300 seniors: a + b + c +d = 300
There are a total of 420 seniors.
So e + f = 120. One of the subjects has to be 20 for the other to be maximized. If e = 20, then f = 100.
A
Question: By selling 150 mangoes, a fruit-seller gains the selling price of 30 mangoes. Find the gain percent?
A.100%
B.75%
C.60%
D.25%
Answer: D.25%
Explanation: SP = CP + g
150 SP = 150 CP + 30 SP
120 SP = 150 CP
120 --- 30 CP
100 --- ? => 25%
Answer: D
Question: What is the average of xx,2x2x,and 66?
A.x+2
B.x+2x
C.x+2x+2
D.2x+2
Answer: C.x+2x+2
Explanation: By the definition of an average, we get:
x+2x+63=3x+63x+2x+63=3x+63
=3(x+2)3=x+2.=3(x+2)3=x+2.
Hence, the answer is x+2x+2 or Option C
Question: ?% of 360 = 93.6
A.277
B.36
C.26
D.72
Answer: C.26
Explanation: ?% of 360 = 93.6
or, ? = 93.6×100/360=26
Answer C
Question: How many ways can 5 friends be arranged around a circular dinner table?
A.24
B.56
C.108
D.120
Answer: A.24
Explanation: The number of ways to order 5 people is 5!
However, around a circular table, each pattern would be repeated 5 times.
So the number of ways to seat 5 friends around a circular table is 4! = 24
The answer is A.
Question: Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who havenotpassed the test, 19 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?
A. 60
B. 70
C. 100
D. 120
Answer: B. 70
Explanation: 30% of the members have passed the test, thus 70% have not passed the test.
We also know that 30+19=49 members have not passed the test, thus 0.7*Total=49 --> Total=70.
Answer: B.
Question: How much 60% of 50 is greater than 42% of 30?
A.18
B.91
C.11
D.17.4
Answer: D.17.4
Explanation: (60/100) * 50 – (42/100) * 30
30 - 12.6 = 17.4
Answer: D
Question: The length of the bridge, which a train 150 meters long and travelling at 45 km/hr can cross in 30 seconds, is?
A.388
B.267
C.225
D.288
Answer: C.225
Explanation: Speed = (45 * 5/18) m/sec = (25/2) m/sec. Time = 30 sec. Let the length of bridge be x meters. Then, (150 + X)/30 = 25/2 ==> 2(150 + X) = 750 ==> X = 225 m.
Answer: C
Question: Which of the following expressions CANNOT be equal to 0 when x^2 − 2x = 3?
A.x^2 − 6x + 9
B.x^2 − 4x + 3
C.x^2 − x − 2
D.x^2 − 7x + 6
Answer: D.x^2 − 7x + 6
Explanation: E. Can x^2 − 9 = 0?
Factor to get (x + 3)(x - 3) = 0
So, (x + 3) = 0 or (x - 3) = 0
ELIMINATE E
D. Can x^2 − 7x + 6 = 0
Factor to get (x - 1)(x - 6) = 0
So, (x - 1) = 0 or (x - 6) = 0
Since we cannot conclude that (x - 3) = 0 or (x + 1) = 0, the correct answer must be D
Question: Find the wrong number below mentioned series
17, 600,6000,550,750
A.600
B.6000
C.17
D.550
Answer: C.17
Explanation: 17 is the only prime number or odd number in the series.
ANSWER:C
Question: Pipes A and B can fill a tank in 9 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in
A.1 13/17 hours
B.2 8/11 hours
C.3 9/17 hours
D.5 1/7 hours
Answer: D.5 1/7 hours
Explanation: Solution
Net part filled in 1 hour	= (1/9 + 1/6 -1/12)
= 7/36.
Therefore, the tank will be full in 36/7 hrs.	â€¹=â€º 5 1/7 hrs.
Answer D
Question: What is the area of a square with perimeter 16P ?
A. 16p^2
B. 4P
C. P^2/4
D. P/16
Answer: A. 16p^2
Explanation: Each side is 4p
A = (4p)^2 = 16(p^2)
Answer A
Question: A company received $2 million in royalties on the first $10 million in sales and then $8 million in royalties on the next $100 million in sales. By what percent did the ratio of royalties to sales decrease from the first $10 million in sales to the next $100 million in sales?
A.30%
B.40%
C.50%
D.60%
Answer: D.60%
Explanation: First find out (ratio of royalties to sales):
2:10 First
0.2
8:100 Second
0.08
Decrease = 0.2-0.08 = 0.12
Percent = (0.12/0.20) = 60%.
ANSWER:D
Question: If the productivity of a brigade grows by 40% when the number of the workers in the brigade is increased by one, then which of the following is closest to the ratio of the productivity of a 12-person brigade to that of a 10-person brigade?
A.1.51
B.0.82
C.1.2
D.1.21
Answer: A.1.51
Explanation: B = 10-men brigade
p = increase in the productivity = 40%
Solution: B x p = B x 1.4 = 1.4B -------> the productivity of 11 men brigade
1.4B x p = 1.4B x 1.1 = 1.51B -----> the productivity of 12 men brigade
The ratio of the productivity of a 12-men brigade to that of a 10-men brigade = 1.51B/B = 1.51
A
Question: The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 9 km/hr completes one round in 5 min, then the area of the park (in sq. m) is?
A.337500 m
B.300000 m
C.153600 m
D.33750 m
Answer: D.33750 m
Explanation: Perimeter = Distance covered in 5 min. = (9000 x 5)/60 m = 750 m.
Let length = 3x metres and breadth = 2x metres.
Then, 2(3x + 2x) = 750 or x = 75.
Length = 225 m and Breadth = 150 m.
Area = (225 x 150) m2 = 33750 m
D
Question: If five chimpanzee can eat five mangoes in five minutes.
How many minutes would it take for four chimpanzee to eat four mangoes ?
A.5 minutes
B.10 minutes
C.8 minutes
D.14 minutes
Answer: A.5 minutes
Explanation: A
5 minutes
Question: In a certain sequence of 8 numbers, each number after the first is 1 more than the previous number. If the first number is −4, how many of the numbers in the sequence are positive?
A.None
B.One
C.Two
D.Three
Answer: D.Three
Explanation: Non - Negative ( zero to positive infinity )
Solution to the question :
-4,-3,-2,-1,0 , 1,2,3
Hence ans is 3 ..option D
Question: Bag A contains red, white and blue marbles such that the red to white marble ratio is 1:3 and the white to blue marble ratio is 2:3. Bag B contains red and white marbles in the ratio of 1:4. Together, the two bags contain 22 white marbles. How many red marbles could be in bag A?
A.1
B.3
C.4
D.2
Answer: D.2
Explanation: # of Red marbles in Bag A can be either 2 or 6. No 2 in the choices, so 6. D.
Bag A:
R:W:B = 2:6:9
Bag B
R:W = 1:4
6X + 4Y = 22 i.e 3X + 2Y = 11
X has to be odd to make an odd sum from the eq.
X = 1 , Y = 4 OR X = 3, Y = 1
So R can be 2X i.e 2 or 6.
Answer D
Question: A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?
A.33
B.77
C.48
D.99
Answer: C.48
Explanation: D = 540 + 180 = 720
S = 54 * 5/18 = 15 mps
T = 720/15 = 48 sec
Answer:C
Question: Three candidates contested an election and received 1136, 7636 and 15000 votes respectively. What percentage of the total votes did the winning candidate get?
A.46%
B.63%
C.74%
D.63%
Answer: B.63%
Explanation: B
15000/(1136 + 7636 + 15000) = 63%.
Question: If 20 percent of the members of a certain organization are women and 2/8 of the members of the organization are married men, which of the following statements concerning the membership must be true? I. The number of women in the organization is greater than the number of married men in the organization. II. The number of women in the organization is greater than the number of unmarried men in the organization. III. The number of unmarried men in the organization is greater than the number of married men in the organization.
A.III
B.II
C.I
D.I,II
Answer: A.III
Explanation: 2/10 (20%) of the members are women and 2/8 of the members are married men. Let the total numbers of members is 80 (the LCM of 10 and 8). Then there are:
2/10*80 = 16 women;
80 - 16= 64 men;
2/8*64 = 16 married men;
64 - 16 = 48 unmarried men.
So, only option III is true.
Answer: A
Question: A and B are two stations 125km apart. A train starts from A at 6a.m. and travels towards B at 50kmph. Another train starts from B at 7a.m. and travels towards A at 25kmph. At what time do they meet?
A.7a.m.
B.8a.m.
C.9a.m.
D.9.30a.m.
Answer: B.8a.m.
Explanation: Suppose they meet x hours after 6 a.m.
Distance moved by first train in x hours + distance moved by 2nd train in x-1 hrs = 125
50x+25(x-1) = 125
x = 2hr
So they meet 2hr after 6a.m. is at 8a.m.
Answer is B
Question: In the x-y plane, point (x, y) is a lattice point if both x and y are integers. A rectangle has a center at (1, 2) and width (x), length (y), 6", 4", respectively. Some points, such as the center (1, 2), are inside the rectangle, but a point such as (4, 2) is on the rectangle, but not in the rectangle. How many lattice points are in the rectangle?
A.7
B.71
C.72
D.17
Answer: D.17
Explanation: The lattice points that are in the rectangle can be calculated as follows: divide the rectangle into 4 quadrants. Now we solve for one quadrant, multiply by 4, and subtract the repeating points along the vertical and horizontal lines that lie along the center point.
For one quadrant we have:
vertical = (1, 2), (1, 3),
horizontal = (2, 2), (3, 2), (don't count center again),
others = (2, 2), (3, 3).
There are 6 points. So, 6 * 4 = 24. Subtract repeating points, 7, we get 17.
There are a total of 17 lattice points in the square.
Answer: D
Question: A password of a computer used three digits where they are from 0 and 9. What is the probability that the password solely consists of prime numbers and zero?
A.1/32
B.1/16
C.1/8
D.2/5
Answer: C.1/8
Explanation: We have three digits can be used for password -0,2,3,5,7.
Assuming that the numbers can be repeated any number of times in the password, probability of selecting any one of them is 5/10 (out of 10 digits from 0-9)
So, 5/10 * 5/10 * 5/10 =1/8 (C)
Question: A boy can reach a certain place in 30 hours. If he reduces his speed by 1/30th, he goes 3 km less in that time. Find his speed.
A.3 km/hr.
B.6 km/hr
C.8 km/hr
D.14 km/hr
Answer: A.3 km/hr.
Explanation: Explanation :
Solution: Let the speed be x km/hr. then,
30x - (30 * 29x/30) = 3
=> x = 3 km/hr.
Answer : A
Question: A money lender lent a total of $1400 to two of his customers. He charged at the rate of 5%p.a. to one of them and 6% p.a. to the other. If he earned an average of 5.67% on $1400, how much did he lend to each of the two customers?
A.700; 1100
B.938; 462
C.1000; 800
D.1200; 800
Answer: B.938; 462
Explanation: The method given above is the one given in the book.
However the method I used was
(1*x*5)/100 + (1400-x)*6/100 = 1400*5.67/100
Simplifying we get x=462
B
Question: A man can row with a speed of 20 kmph in still water. If the stream flows at 11 kmph, then the speed in downstream is?
A.28
B.26
C.31
D.87
Answer: C.31
Explanation: M = 20
S =11
DS = 20 + 11
=31
Answer: C
Question: A three digit number consists of 9,5 and one more number . When these digits are reversed and then subtracted from the original number the answer yielded will be consisting of the same digits arranged yet in a different order. What is the other digit
A.3
B.4
C.5
D.6
Answer: B.4
Explanation: 954
-459
---------
495
Rearrenge=954
ANSWER:B
Question: Arun borrowed a certain sum from Manish at a certain rate of simple interest for 2 years. He lent this sum to Sunil at the same rate of interest compounded annually for the same period. At the end of two years, he received Rs. 2400 as compound interest but paid Rs. 2000 only as simple interest. Find the rate of interest.
A.40%
B.30%
C.20%
D.10%
Answer: A.40%
Explanation: Explanation:
Let the sum be x
Simple interest on x for 2 years = Rs.2000
Simple interest = PRT/100
2000 = x Ãƒâ€” R Ãƒâ€” 2100
Ã¢â€¡â€™ x R = 100000 --- (1)
Compound Interest on x for 2 years = 2400
P(1+R/100)T Ã¢Ë†â€™ P = 2400
x (1+R/100)2 Ã¢Ë†â€™ x = 2400
x (1 +2R/100+R210000)Ã¢Ë†â€™x=2400x(2R100+R210000)=2400
2xR/100 + xR2/10000 = 2400--- (2)
Substituting the value of xR from (1) in (2) ,we get
(2Ãƒâ€”100000)/100 + 100000 Ãƒâ€” R10000 = 2400
2000+10R = 2400
10R=400
R=40%
ANSWER IS A
Question: Reena took a loan of 1200 with simple interest for as many years as the rate of interest. If she paid 432 as interest at the end of the loan period, what was the rate of interest?
A.3.6
B.6
C.18
D.Cannot be determined
Answer: B.6
Explanation: Explanation: Let rate = R% and time = R years.
Then, (1200 x R x R)/100 = 432
12R² = 432
R² = 36
R = 6.
Answer: Option B