RikoteMaster/aqua-rat-mcqa huggingface dataset:
Question: A salesman’s terms were changed from a flat commission of 5% on all his sales to a fixed salary of Rs.1400 plus 2.5% commission on all sales exceeding Rs. 4,000. If his remuneration as per new scheme was Rs. 600 more than that by the previous schema, his sales were worth?
A.12028
B.12000
C.20000
D.12197
Answer: C.20000
Explanation: [1400 + (X-4000) * (2.5/100)] - X * (5/100)
= 600
X = 20000
Answer: C
Question: 45 men working 8 hours per day dig 30 m deep. How many extra men should be put to dig to a depth of 50 m working 6 hours per day?
A.77
B.66
C.50
D.55
Answer: D.55
Explanation: (45 * 8)/30 = (x * 6)/50 => x =100
100 – 45 = 55
Answer: D
Question: John sells his laptop to Mark at a loss of 20% who subsequently sells it to Kevin at a profit of 25%. Kevin after finding some defect in the laptop, returns it to Mark but could recover only Rs.4.50 for every Rs. 5 he had paid. Find the amount of Kevin’s loss if John had paid Rs. 1,75,000 for the laptop.
A.Rs. 13,500
B.Rs. 2,500
C.Rs. 17,500
D.Rs. 18,500
Answer: C.Rs. 17,500
Explanation: Let’s assume John bought the laptop for Rs. 100,
He then sells it to Mark for Rs. 80,
Who consequently sells it to Kevin for Rs. 100,
Then, Kevin sells it back to Mark for Rs. 90 (Rs.4.50 for every Rs. 5 that he had paid initially), so he suffers a loss of Rs. 10,
Therefore, for Rs 100 there is a loss of Rs. 10,
Then for Rs. 1,75,000 there will be a loss of Rs. 17,500
ANSWER:C
Question: A sum of money is to be distributed among A, B, C, D in the proportion of 5 : 2 : 4 : 3. If C gets $500 more than D, what is C's share?
A.$1200
B.$1600
C.$1800
D.$2000
Answer: D.$2000
Explanation: Let the shares of A, B, C and D be 5x, 2x, 4x and 3x respectively.
Then, 4x - 3x = 500
x = $500
C's share = 4x = 4*$500 = $2000
The answer is D.
Question: In a sample of college students, 20 percent are third year students and 80 percent are not second-year students. What fraction of those students who are not third-year students are second-year students?
A. 1/4
B. 2/3
C. 4/7
D. 1/2
Answer: A. 1/4
Explanation: = 20/80. = 1/4
my answer is A too
Question: UBA Capital recently bought Brand new vehicles for office use. UBA capital only went for Toyota and Honda and bought more of Toyota than Honda at the ratio of 6:4. If 60% of the Toyota bought and 40% of the Honda bought were SUVÃ¢â‚¬â„¢s. How many SUVÃ¢â‚¬â„¢s did UBA capital buy in the aforementioned purchase?
A.66%
B.64%
C.68%
D.52%
Answer: D.52%
Explanation: let total no of Vehicles bought be 100, Toyota 60 and Honda 40, so total number of SUV's bought for Toyota and Honda respectively 60* 60/100=36 and 40* 40/100=16
so total 52 SUV's were bought out of 100 Vehicles bought..so required % is 52%
ANSWER:D
Question: By selling a watch for Rs.400/-, a man loses 20% what is that watch cost price
A.s. 700/-
B.s. 800/-
C.s. 880/-
D.s. 500/-
Answer: D.s. 500/-
Explanation: 80 % ------> 400 (80 * 5 = 400)
100 % ------>500 (100 * 5 = 500)
Cost price = Rs. 500/-
D
Question: The ratio of the present age of Viju to that of Aju is 7:2. Four years from now, the ratio of the ages of Viju to Aju will be 5:2. What was Viju age 10 years ago ? (RBI Assistant 2015)
A.11
B.18
C.12
D.15
Answer: A.11
Explanation: Let the present age of Viju be 7x years and that of Aju be 2x years.
Then, 4 years from now
7x + 4 / 2x + 4 = 5 / 2
or 4x = 12
or x = 3
Viju present age = 7 * 3 = 21 years
Viju age 10 years ago = 21 - 10 = 11 years
answer :A
Question: Find the principle on a certain sum of money at 5% per annum for 3 years if the amount being Rs.1120?
A.974
B.1067
C.1977
D.1056
Answer: A.974
Explanation: 1120 = P [1 + (5*3)/100]
P= 974
Answer: A
Question: If x and y are integers and x divided by y is 19.15, then which of the following integers is a possible value for the remainder when x is divided by y? I. 15 II. 5 III. 3
A.I,III only
B.II only
C.I only
D.III only
Answer: A.I,III only
Explanation: x=19.15y from which x = 19y + 15y/100 or x = 19y + 3y/20.
Since x and y are integers, 3y/20 must also be an integer. 3 is not divisible by 20, then y must be divisible by 20, and therefore, y/20 is an integer and 3y/20 is an integer which is a multiple of 3. From the given answers, only 15 and 3 are divisible by 3.
Answer A
Question: At the beginning of the year, the ratio of juniors to seniors in high school X was 5 to 6. During the year, 10 juniors and twice as many seniors transferred to another high school, while no new students joined high school X. If, at the end of the year, the ratio of juniors to seniors was 6 TO 7, how many juniors were there in high school X at the beginning of the year?
A.250
B.100
C.260
D.110
Answer: A.250
Explanation: let the total number of juniors and seniors at the beginning of the year be 5x and 6x respectively.
now 10 juniors and 20 seniors are transferred to another school. thus no. of juniors and seniors students left in the school X are 5x-10 and 6x-20 respectively. the ratio of these juniors and seniors students = 6/7
thus we have (5x-10)/(6x-20) = 6/7
35x-70=36x-120
x=50
thus total no. of seniors at the beginning of the year =5(50)=250
Answer:option A
Question: Which of the following is closer to (6!+4!)-(6!-4!)?
A.28
B.38
C.48
D.58
Answer: C.48
Explanation: 6!+4!)-(6!-4!)=720+24-720+24
= 48
Answer: C
Question: A sum was put a simple interest at a certain rate for 5 years. Had it been put at 2% higher rate, it would have fetched Rs. 250 more. The sum is:
A.s.2000
B.s.2500
C.s.3000
D.s.3500
Answer: B.s.2500
Explanation: Explanation :
Let the sub be Rs.x and the initial rate be R%.Then
x Ã— (R+2) Ã— 5/100âˆ’xÃ—RÃ—5/100=250
â‡’x Ã— 2Ã—5/100=250
â‡’x Ã— 5 /100=125
â‡’5x=12500
â‡’x=2500
Answer : Option B
Question: The ratio of the radius of two circles is 2: 3, and then the ratio of their areas is?
A.1:7
B.2:9
C.4:9
D.3:7
Answer: C.4:9
Explanation: r1: r2 = 2: 3
Î r1^2: Î r2^2
r1^2: r2^2 = 4:9
Answer: C
Question: If a/x = 3 and a/y = 4, then (x + y) in terms of a
A.a/4
B.5a/7
C.7a/12
D.6a/13
Answer: C.7a/12
Explanation: Ratio 1:
x= a/3
Ratio 2:
y = a/4
x+y = a/3+a/4 = 7a/12
Answer is C
Question: Two taps can separately fill a cistern 10 minutes and 12 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?
A.7
B.7.8
C.6
D.9
Answer: B.7.8
Explanation: 1/10 + 1/12 - 1/x = 1/18
x = 180/23 = 7.8
Answer: B
Question: Ravi's brother is 3 years senior to him. His father was 28 years of age when his sister was born while his mother was 26 years of age when he was born. If his sister was 4 years of age when his brother was born, what were the ages of Ravi's father and mother respectively when his brother was born ?
A.32 years, 23 years
B.32 years, 29 years
C.35 years, 29 years
D.35 years, 33 years
Answer: A.32 years, 23 years
Explanation: Explanation:
When Ravi's brother was born, let Ravi's father's age = x years and mother's age = y years.
Then, sister's age = (x - 28) years. So, x - 28 = 4 or x = 32.
Ravi's age = (y - 26) years.
Age of Ravi's brother = (y - 26 + 3) years = (y - 23) years.
Now, when Ravi's brother was born, his age = 0 i.e. y - 23 = 0 or y = 23.
Answer: A) 32 years, 23 years
Question: If 40% of a certain number is 160, then what is 50% of that number?
A.270
B.380
C.200
D.360
Answer: C.200
Explanation: Explanation:
40% = 40*4 = 160
50% = 50*4 = 200
Answer: Option C
Question: The radius of a wheel is 22.4 cm. What is the distance covered by the wheel in making 200 resolutions.
A.271.34 m
B.281.34 m
C.291.34 m
D.301.34 m
Answer: B.281.34 m
Explanation: In one resolution, the distance covered by the wheel is its own circumference. Distance covered in 200 resolutions.
= 200 * 2 * 22/7 * 22.4
= 28134 cm
= 281.34 m
Answer: B
Question: Hanks Manufacturing recently conducted a survey of its employees. The results showed that of the n people who work at the company, 1/3 drink decaffeinated coffee, and the remainder drink regular coffee. Of those who do not drink decaf, 2/5 add cream to their coffee. Which of the expressions below accurately represents the number of employees who do not drink regular coffee with cream.
A.2n/3
B.n/8
C.4n/15
D.11n/15
Answer: D.11n/15
Explanation: Decaffeinated coffee = 1/3
Regular coffee = 2/3
"Of those who do not drink decaf, 2/5 add cream to their coffee."
means 'of the regular drinkers, i.e. of the 2/3, 2/5 add cream'
Regular coffee drinkers who add cream = 2/5 * 2/3 = 4/15
The fraction that drinks "regular coffee with cream" = 4/15
The fraction that does not drink "regular coffee with cream" is the rest = 1 - 4/15 = 11/15
Number of people = 11n/15
ANSWER:D
Question: If the sum of four consecutive positive integers is A, then the sum of the next four consecutive integers in terms of A is:
A.A+4
B.A+16
C.2A
D.2A + 4
Answer: B.A+16
Explanation: In Case of Consecutive Integers or Integers in Arithmetic Progression Mean = Median
I.e. Median = A/4 = Mean = Average of Second and Third Integer
First Integer = A/4 - 1.5
Second Integer = A/4 - .5
Third Integer = A/4 + .5
Fourth Integer = A/4 + 1.5
i.e.
Fifth Integer = A/4 + 2.5
Sixth Integer = A/4 + 3.5
Seventh Integer = A/4 + 4.5
Eighth Integer = A/4 + 5.5
Now Mean of next 4 Integers = Median = A/4 + 4
i.e. Sum of Next 4 integers = (A/4 + 4)*4 = A+16
Answer: option B
Question: What is the area of a square field whose diagonal of length 12 m?
A.288
B.72
C.200
D.112
Answer: B.72
Explanation: d2/2 = (12 * 12)/2
= 72
Answer: B
Question: A boat goes 6 km up stream and 7 km down stream in 5 hours. It goes 3 km up stream and 6 km down stream in 3 hours. The speed of the boat in still water is:
A.2 km/hr
B.5.4 km/hr
C.4.8 km/hr
D.3.33 km/hr
Answer: D.3.33 km/hr
Explanation: Explanation:
Let speed of the boat in still water be x km/hr
speed of the stream be y km/hr
then, speed of upstream = (x-y) km/hr
speed of down stream = (x+y) km/hr
6/(x-y) + 7/(x+y) = 5
3/(x-y) + 6/(x+y) = 3
Take 1/(x-y) = a & 1/(x+y) = b
6a + 7b = 5 ---(1)
3a + 6b = 3 ----(2)
(1) -------> 6a + 7b = 5
(2) x 2 ---> 6a + 12b = 6
------------------------
-5b = -1
b = 1/5
3a + (6/5) = 3
3a = 3 - 6/5
3a = (15 - 6)/5 = 9/5
a = 3/5
3/5 = 1/(x-y)
1/5 = 1/(x+y)
3x - 3y = 5 ---->(iii)
x + y = 5 ----> (iv)
(iv) x 3 ----> 3x + 3y = 15
(iii) -------> 3x - 3y = 5
-----------
6x = 20
x = 20/6 = 10/3 = 3.33
Answer: Option D
Question: 1, 6, 16, 31, 51, (....)
A.61
B.66
C.76
D.86
Answer: B.66
Explanation: Explanation:
The pattern is 5, 10, 15, 20, 25, etc
Hence 25=66
Answer : B
Question: (69842 x 69842 - 30158 x 30158) / (69842 - 30158) = ?
A.100000
B.69842
C.39684
D.30158
Answer: A.100000
Explanation: Answer
Given expression = [(69842)2 - (30158)2] / [(69842 - 30158)]
= [ (69842 - 30158) (69842 + 30158) ] / (60842 - 30158)
= 100000
Correct Option: A
Question: (3x−4)⋅(3x+4)=?
A.3x2 - 4
B.9x2 - 16
C.-9x2 + 16
D.9x - 8
Answer: B.9x2 - 16
Explanation: Solution:
We use the product of the sum and the difference of the two terms:
(a+b)⋅(a−b)=a2−b2(a+b)⋅(a−b)=a2−b2
(3x−4)⋅(3x+4)=(3x)2−42=9x2−16
Answer B
Question: If x = 32 * 64 * 27 / 8, Find the tenth place of x,
A.1
B.2
C.5
D.4
Answer: A.1
Explanation: x = 32 * 64 * 27 / 8
x = 2^5 * 4^3 * 3*3 / 2^3
x = 2^2 * 12*3
x = 6912
Ans: A
Question: If p - q = 3 and
p2+q2=29
, find the value of pq.
A.7
B.8
C.9
D.10
Answer: D.10
Explanation: Explanation:
We know
2ab=(a2+b2)−(a−b)2
2pq=29−9=20
=>pq=10
Option D
Question: Having received his weekly allowance, John spent 3/5 of his allowance at the arcade. The next day he spent one third of his remaining allowance at the toy store, and then spent his last $0.90 at the candy store. What is John’s weekly allowance?
A.$2.40
B.$3.00
C.$3.40
D.$3.60
Answer: C.$3.40
Explanation: Total allowance=X
Amount spent at the arcade=3/5X
Amount Remaining=2/5X
Amount Spent at the toy store=2/5*1/3X=2/15X
Amount Remaining=2/5X-2/15X=4/15X
Now, 4/15X=$0.9
Therefore, X=$3.40. Answer C
Question: The annual cost of owning and operating a car, C dollars, is a linear function of the distance, d kilometers, it is driven c = md + b
The cost is $4600 for 10 000 km and $9100 for 25 000 km.
(a) Determine the values of m and b.
(b) Write c as a function of d.
A.m = 0.3 and b = 1500
B.m = 0.3 and b = 1600
C.m = 0.3 and b = 1700
D.m = 0.3 and b = 1800
Answer: B.m = 0.3 and b = 1600
Explanation: Solution:
(a)
c = md + b
The cost is $ 4600 for 10 000 km
4600 = m (10 000) + b
10 000 m + b = 4600
b = -10 000 m + 4600 ------- (i)
The cost is $ 9100 for 25 000 km
9100 = m (25 000) + b
9100 = 25 000 m + b
25 000 m + b = 9100
b = -25 000 m + 9100 --------- (ii)
From equation (i) and (ii) we get;
-10 000 m + 4600 = -25 000 m + 9100
-10 000 m + 25 000 m = 9100 – 4600
15 000 m = 4500
m = 4500/15 000
m = 3/10
m = 0.3
Now, put the value of m = 0.3 in equation (i) we get;
b = -10 000 (0.3) + 4600
b = -3000 + 4600
b = 1600
Answer: m = 0.3 and b = 1600
(b) c = md + b
m = 0.3
b = 1600
c = 0.3d + 1600
Answer: c = 0.3d + 1600
Answer B
Question: The breath of a rectangle is three - fifths of the radius of a circle. The radius of the circle is equal to the side of the square, whose area is 2025 sq.units. What is the area (in sq.units) of the rectangle if the rectangle if the length is 10 units?
A.370 sq.units
B.270 sq.units
C.170 sq.units
D.470 sq.units
Answer: B.270 sq.units
Explanation: Given that the area of the square = 2025sq.units
=> Side of square = √2025 = 45 units
The radius of the circle = side of the square = 45 units breath of the rectangle = 3/5 * 45 = 27units
Given that length= 10 units
Area of the rectangle = lb = 27* 10 = 270 sq.units
Answer:B
Question: A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?`
A.10/21
B.11/21
C.2/7
D.5/7
Answer: A.10/21
Explanation: Total number of balls = (2 + 3 + 2) = 7.
Let S be the sample space.
Then, n(S)	= Number of ways of drawing 2 balls out of 7
= 7C2 `
=	(7 x 6)/(2 x 1)
= 21.
Let E = Event of drawing 2 balls, none of which is blue.
n(E)	= Number of ways of drawing 2 balls out of (2 + 3) balls.
= 5C2
=	(5 x 4)/(2 x 1)
= 10.
P(E) =	n(E)/n(S)	=	10/21.
Answer:A
Question: A departmental store has 2 managers and 10 associates. The 2 managers have an average salary of $5000. The 10 associates have an average salary of $20000. What is the average salary for the departmental store?
A.$15500
B.$16500
C.$17500
D.$14500
Answer: C.$17500
Explanation: Number of managers is 2
Their average salary is $5000
Number of associates is 10
Their average salary is $20,000
Total salary of managers is 2*5000=$10000
Total salary of associates is 10*20,000=$200,000
Total salary for the departmental store is 200,000+10000=210000
Average salary for the departmental store is 210000/10+2=17500
Answer is C
Question: A train 360 m long runs with a speed of 45 km/hr. What time will it take to pass a platform of 180 m long?
A.38 sec
B.35 sec
C.43.2 sec
D.40 sec
Answer: C.43.2 sec
Explanation: Speed = 45 km/hr = 45 Ã— (5/18) m/s
= 150/12 = 50/4 = 25/2 m/s
Total distance = length of the train + length of the platform
= 360 + 180 = 540 meter
Time taken to cross the platform = 540/(25/2) = 540 Ã— 2/25 = 43.2 seconds
ANSWER:C
Question: A man buys s cycle for $100 and sells it at a loss of 20%. What is the selling price of the cycle?
A.$50
B.$60
C.$70
D.$80
Answer: D.$80
Explanation: S.P. = 80% of the $100 = 80/100 * 100 = $80
Answer is D
Question: One-third of Rahul’s savings in National Savings Certificate is equal to one-half of his savings in Public Provident Fund. If he has Rs. 3,50,000 as total savings, how much has he saved in Public Provident Fund ?
A.Rs. 130,000
B.Rs. 150,000
C.Rs. 160,000
D.Rs. 140,000
Answer: D.Rs. 140,000
Explanation: EXPLANATION
Let savings in N.S.C and P.P.F. be Rs. x and Rs. (350000 – x) respectively. Then,
1/3x=1/2(350000-x)
=> x/3 + x/2 = 175000
=> 5x/6 = 175000
=> x= 175000 x 6 /5= 210000
Savings in Public Provident Fund = Rs. (350000 – 210000) = Rs. 140000
Answer D
Question: In how many ways can a cricketer can score 200 runs with fours and sixes only?
A.13
B.17
C.19
D.16
Answer: B.17
Explanation: 200 runs can be scored by scoring only fours or through a combination of fours and sixes.
Possibilities are 50 x 4, 47 x 4 + 2 x 6, 44 x 4 + 4 x 6 ... A total of 17 ways
ANSWER:B
Question: What is the Mode of the following data set A- {1,2,4,6,4,9,4,10}
A.1
B.10
C.6
D.4
Answer: D.4
Explanation: Mode of a set is the data point that is repeated the most number of times. In the set given, 4 is repeated.
Answer : D
Question: A rectangular photograph is surrounded by a border that is 1 inch wide on each side. The total area of the photograph and the border is M square inches. If the border had been 7 inches wide on each side, the total area would have been (M + 264) square inches. What is the perimeter of the photograph, in inches?
A.8
B.12
C.16
D.20
Answer: B.12
Explanation: Let x and y be the width and length of the photograph.
(x+2)(y+2)=M and so (1) xy + 2x + 2y + 4 = M
(x+14)(y+14)=M and so (2) xy + 14x + 14y + 196 = M+264
Let's subtract equation (1) from equation (2).
12x + 12y + 192 = 264
2x + 2y = 12, which is the perimeter of the photograph.
The answer is B.
Question: Find the area of right angled triangle whose hypotenuse is 15 cm and one of the sides is 12 cm.
A.34 cm²
B.38 cm²
C.54 cm²
D.56 cm²
Answer: C.54 cm²
Explanation: AB² = AC² - BC²
= 15² - 12²
= 225 - 144
= 81
Therefore, AB = 9
Therefore, area of the triangle = ¹/₂ × base × height
= ¹/₂ × 12 × 9
= 54 cm²
ANSWER : C
Question: Six unbiased coin are tossed. What is the probability of getting atmost
one head?
A.61/2
B.61/4
C.63/64
D.63/5
Answer: C.63/64
Explanation: Here n(S)= 2^6
Let E=event of getting atmost one head =
n(E)= 63
P(E)=n(E)/n(S)=63/64
Answer option C)
Question: A train 110 m long is running with a speed of 60 km/hr. In what time will it pass a man who is running at 6 km/hr in the direction opposite to that in which the train is going?
A.7
B.6
C.5
D.4
Answer: B.6
Explanation: Speed of train relative to man = 60 + 6 = 66 km/hr.
= 66 * 5/18 = 55/3 m/sec.
Time taken to pass the men = 110 * 3/55 = 6 sec.
Answer:B
Question: The center of a circle is (5, -3). (5, 7) is outside the circle, and (1, -3) is inside the circle. If the radius, r, is an
integer, how many possible values are there for r?
A. 3
B. 5
C.11
D. 12
Answer: B. 5
Explanation: r must be greater than 4 and smaller than 10, hence r=5,6,7,8 or 9.
Answer B
Question: Salaries of Ravi and Sumit are in the ratio 2 : 3. If the salary of each is increased by Rs. 4000, the new ratio becomes 40 : 57. What is Sumit's salary?
A.Rs. 38,00
B.Rs. 38,000
C.Rs. 40,000
D.Rs. 57,000
Answer: B.Rs. 38,000
Explanation: Let the original salaries of Ravi and Sumit be Rs. 2x and Rs. 3x respectively.
Then, 2x + 4000/3x + 4000 = 40/57
57(2x + 4000) = 40(3x + 4000)
6x = 68,000
3x = 34,000
Sumit's present salary = (3x + 4000) = Rs.(34000 + 4000) = Rs. 38,000.
Answer is B.
Question: Find the number of square tiles to cover the floor of a room measuring 4 m * 9 m leaving 0.25 m space around the room. A side of square tile is given to be 25 cms?
A. 425 B. 476 C. 450 D. 350
A.425
B.476
C.450
D.350
Answer: B.476
Explanation: 3 1/2 * 8 1/2 = 1/4 * 1/4 * x => x = 476
ANSWER:B
Question: Find the smallest number that must be added to 1780 to make it a perfect
square.
A.17
B.42
C.69
D.47
Answer: C.69
Explanation: 4 1780 (42
16
82	180
164
16
Number to be added = (43)2 - 1780 = 1849 - 1780 = 69.
ANSWER C 69
Question: In a certain football league, the only way to score is to kick a eld goal
for 3 points or score a touchdown for 7 points. Thus the scores 1, 4
and 8 are not possible. How many positive scores are not possible?
A.5
B.6
C.9
D.11
Answer: B.6
Explanation: One checks directly that the following list of scores up to 14 is the complete list
of obtainable scores up to that point: 3, 6, 7, 9, 10, 12, 13, 14. Now, we have 3 consecutive
scores, namely 12, 13, and 14, which are obtainable, and this implies every score > 14 is
obtainable. To see this, observe that if n is an obtainable score, then so is n + 3 (simply
add another eld goal to whatever it took to get n points); hence, 15 = 12+3, 16 = 13+3,
and 17 = 14+3 are all obtainable and so are 18 = 15+3, 19 = 16+3, 20 = 17+3, and so
on. Therefore, the positive integral scores which are not obtainable are 1, 2, 4, 5, 8, and
11. Thus, the answer is 6
correct answer B
Question: Father's age is three years more than three times the son's age. After three years, father's age will be ten years more than twice the son's age. What is the father's present age?
A.339
B.33
C.27
D.28
Answer: B.33
Explanation: Let the son's present age be x years.then father's present age will be 3x + 3 years.
After 3 years,3x + 3 + 3 = 2 (x + 3) + 10
Solving we get, x = 10.
Substituting x =10 in 3x + 3,
Hence father's present age will be x = 33 years.
Answer:B
Question: A farm used two harvesting machines, H and K, to harvest 100 acres of wheat. Harvesting machine H, working alone at its constant rate, harvested 40 acres of wheat in 8 hours. Then harvesting machine K was brought in, and harvesting machines H and K, working together at their respective constant rates, harvested the remaining acres of wheat in 6 hours. Harvesting machine K harvested how many acres of wheat per hour?
A. 4
B. 8
C. 12
D. 13
Answer: A. 4
Explanation: Rate of H = 6 acres/hr
Remaining land to be harvested = 100 - 40 = 60
Rate of H and K = 60/6 = 10 acres/hr
Rate of K = 10 - 6 = 4
Answer: A
Question: A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?
A.5/8
B.5/9
C.5/5
D.5/2
Answer: B.5/9
Explanation: Two balls can be picked from nine balls in ⁹C₂ ways.
We select one white ball and one red ball from five white balls and four red balls. This can be done ⁵C₁ . ⁴C₁ ways.
The required probability = (5 * 4)/⁹C₂ = 20/36
= 5/9
Answer: B
Question: In a stream running at 3 Kmph, a motor boat goes 10 Km upstream and back again to the starting point in 57 minutes. Find the speed of motor boat in still water?
A.18 kmph
B.22 kmph
C.16 kmph
D.20 kmph
Answer: B.22 kmph
Explanation: Explanation:
Let the speed of motor boat instill water be X kmph
Then, speed in downstream = (X + 3) km
and. speed in upstream = (X - 3) kmph
Time taken to row 10km & back = (10/X+3,10/X-3)
10/X+3 + 10/X-3 = 57/60
11X2 - 240X - 44 = 0
(X - 22)(11x + 2) = 0
X = 22 or X = -2/11
Then X = 22 kmph
Answer: Option B
Question: Gio, the circus Elephant, is currently three times older than Lee, the circus Lion. In ten years from now, Lee the circus Lion will be exactly half as old as Gio, the circus Elephant. How old is Gio today?
A.20
B.23
C.30
D.28
Answer: C.30
Explanation: Gio, the circus Elephant, is currently three times older than Lee, the circus Lion.
Gio = 3*Lee
Usually, ages are integers so there is a good possibility that the age of Gio is 30 (the only option that is a multiple of 3).
Then age of Lee would be 10. In 10 yrs, Gio would be 40 and Lee would be 20 - so Lee would be half as old as Gio.
Answer (C)
Question: The H.C.F. of two numbers is 11 and their L.C.M. is 7700. If one of the numbers is 275, then the other is:
A.279
B.283
C.308
D.318
Answer: C.308
Explanation: Other number =	(11 x 7700)/275	= 308.
ANSWER :C
Question: Micheal and Adam can do together a piece of work in 20 days. After they have worked together for 16 days Micheal stops and Adam completes the remaining work in 10 days. In how many days Micheal complete the work separately.
A.80 days
B.100/3 days
C.120 days
D.110 days
Answer: B.100/3 days
Explanation: Rate of both = 1/20
Together they do = 1/20*16 = 4/5
Left work = 1 - 4/5 = 1/5
Adam completes 1/5 work in 10 day
so he took 10*5 = 50 days to complete the left work alone.
Thus the rate of adam is 1/50
Rate of Micheal = 1/20 - 1/50 = 1/(100/3)
Thus micheal takes 100/3 days to complete the whole work.
ans. B.
Question: A train passes a station platform in 36 sec and a man standing on the platform in 20 sec. If the speed of the train is 90 km/hr. What is the length of the platform?
A.400
B.488
C.477
D.426
Answer: A.400
Explanation: Speed = 90* 5/18 = 25 m/sec.
Length of the train = 25 * 20 = 500 m.
Let the length of the platform be x m . Then,
(x + 500)/36 = 25 => x =400 m.
Answer: A