RikoteMaster/aqua-rat-mcqa huggingface dataset:
Question: If n is a prime number greater than 3, what is the remainder when n^2 is divided by 11?
A.0
B.1
C.2
D.3
Answer: D.3
Explanation: There are several algebraic ways to solve this question including the one under the spoiler. But the easiest way is as follows:since we can not have two correct answersjust pick a prime greater than 3, square it and see what would be the remainder upon division of it by 11.
n=5 --> n^2=25 --> remainder upon division 25 by 11 is 3.
Answer: D.
Question: A train,130 metres long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. What is the length of the bridge?
A.210
B.225
C.235
D.245
Answer: D.245
Explanation: Speed =45 km/hr=45×5/18 m/s =12.5 m/s Distance travelled = (Speed x Time)
Distance travelled = 12.5×30=375 m
length of the bridge = 375-130 = 245 m
Answer: D
Question: Mike is 50% less efficient than Alice. How much time will they, working together, take to complete a job which Alice alone could have done in 15 days?
A.5 days
B.10 days
C.9 days
D.18 days
Answer: C.9 days
Explanation: Ratio of times taken by Alice and Mike = 100 : 150 = 2 : 3.
Suppose Mike takes x days to do the work.
Then, 2 : 3 : : 15 : x â‡’ x = (15Ã—3)/2 â‡’ x = 45â„2
Aliceâ€™s 1 dayâ€™s work = 1â„15; Mikeâ€™s 1 days work = 2â„45
(Alice + Mike)â€™s 1 dayâ€™s work = (1â„15 + 2â„45) = 1â„9
âˆ´ Alice and Mike together can complete the job in 9 days.
Answer C
Question: A company organized a recruiting process for 3 vacant positions of assistant manager for its product launches. The company's efforts yielded 11 eligible candidates. How many sets of 3 candidates can the company choose to fill the 3 assistant manager positions?
A. 2,060
B. 1,320
C. 165
D. 315
Answer: C. 165
Explanation: 11*10*9/3*2*1 = 165
C
Question: In a race with 30 runners where 5 trophies will be given to the top 7 runners (the trophies are distinct: first place, second place, etc), how many ways can this be done?
A.8^8 ways
B.8^9 ways
C.7^5 ways
D.8^7 ways
Answer: C.7^5 ways
Explanation: 7 people can be prized with 5 distinct prizes in 7^5 ways
ANSWER:C
Question: Fresh grapes contain 90% by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 40 kg of fresh grapes?
A.5 kg
B.2.4 kg
C.2.5 kg
D.10 kg
Answer: A.5 kg
Explanation: The weight of non-water in 20 kg of fresh grapes (which is 100-90=10% of whole weight) will be the same as the weight of non-water in x kg of dried grapes (which is 100-20=80% of whole weight), so 40âˆ—0.1=xâˆ—0.8--> x=5
Answer: A
Question: A can do half the work in one day where as B can do it full. B can also do half the work of C in one day. Ratio in their efficiency will be?
A.1:2:6
B.1:2:9
C.1:2:5
D.1:2:4
Answer: D.1:2:4
Explanation: WC of A: B = 1:2
B: C = 1:2
---------------------
A: B: C = 1:2:4
Answer: D
Question: How many integers C are prime numbers in the range 200 < C < 220?
A. 1
B. 2
C. 3
D. 4
Answer: A. 1
Explanation: My friend, every single odd number greater than can be written either as 4C+1 or as 4C+3. If you divide any odd number by 4, you will get a remainder of either 1 or 3. That's not a rule unique to prime numbers at all.
The 6C+1 or 6C-1 rule is basically every odd number that is not divisible by three, so it narrows the search a little.
Here's how I thought about the problem. First, eliminate all the even numbers and the odd multiples of 5 in that range. That leaves us with:
{201, 203, 207, 209, 211, 213, 217, 219}
Eliminate the four multiples of 3. Notice that 21 is a multiple of 3, so 210 is also a multiple of 3. If we add or subtract 3 or 9, we get more multiples of three. When we eliminate those, we are left with.
{203, 209, 211, 217}
Now, notice that a cool thing about this range is that 210 is also a multiple 7 (again, because 21 is a multiple of 7). This means that
210 - 7 = 203
210 + 7 = 217
Those two numbers are also multiples of 7, so eliminate them from the list. Now, we are left with
{209, 211}.
We've already checked all the prime numbers less than 10, so we know that neither of these numbers is divisible by anything less than 10. We have to check 11 now. We know that 22 is a multiple of 11, so 220 is also a multiple of 11. This means that
220 - 11 = 209
is also a multiple of 11. We can eliminate this from the list also.
That leaves us with just 211. There's no zero option in the question, so this must be a prime number.
Answer = (A)
Question: In order to obtain an income of Rs. 650 from 10% stock at Rs. 96, one must make an investment of
A.Rs. 3100
B.Rs. 6500
C.Rs. 6240
D.Rs. 9600
Answer: C.Rs. 6240
Explanation: Explanation :
Market Value = Rs. 96.
Required Income = Rs. 650.
Here face value is not given. Take face value as Rs.100 if it is not given in the question
To obtain Rs.10 (ie,10% of the face value 100), investment = Rs.96
To obtain Rs.650, investment = 96/10×650=6240
Answer : Option C
Question: 252 can be expressed as a product of primes as:
A.2 x 2 x 3 x 3 x 7
B.2 x 2 x 3 x 3 x 8
C.2 x 2 x 3 x 3 x 6
D.2 x 2 x 3 x 3 x 1
Answer: A.2 x 2 x 3 x 3 x 7
Explanation: Clearly, 252 = 2 x 2 x 3 x 3 x 7.
Answer: A
Question: If x > 0, x/5 + x/25 is what percent of x?
A.6%
B.24%
C.37 1/2%
D.60%
Answer: B.24%
Explanation: Just plug and chug. Since the question asks for percents, pick 100. (but any number will do.)
100/5 + 100/25= 20+4 =24
24 is 24% of 100=B
Question: One card is drawn from a pack of 52 cards. What is the probability that the card drawn is a queen of club or a king of heart?
A.2/7
B.1/26
C.3/17
D.4/19
Answer: B.1/26
Explanation: Out of 52 cards there will be one queen of club and one king of heart are there
Total 2
probability = 2/52 = 1/26
Answer is B
Question: In how many different number of ways 5 men and 3 women can sit on a shopa which can accommodate persons?
A.42
B.230
C.240
D.250
Answer: A.42
Explanation: 7p2 = 7 Ã— 6 = 42
A
Question: Right now, the ratio between the ages of Sandy and Molly is 4:3. After 6 years, Sandy’s age will be 34 years. What is Molly's age right now?
A.12
B.15
C.18
D.21
Answer: D.21
Explanation: Now, Sandy is 34 - 6 = 28
Molly's age is (3/4) * 28 = 21
The answer is D.
Question: What is the length of the longest pole which can be kept in a room 12 m long, 5 m broad and 3 m high?
A.7
B.9
C.11
D.13.34
Answer: D.13.34
Explanation: Explanation:
d2 = 122 + 52 + 32 = 13.34
D)
Question: an article with cost price of 245 is sold at 34% profit. what is the selling price?
A.328
B.320
C.300
D.207
Answer: A.328
Explanation: sp=1.34*245=328
ANSWER:A
Question: For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.
What is the sum of all the even integers between 99 and 181?
A.4360
B.4890
C.5280
D.5740
Answer: D.5740
Explanation: 100 + 102 +...+ 180 = 41*100 + (2+4...+80) = 41*100 + 2(1+2+...+40) =
41*100 + 2(40)(41)/2 = 140*41 = 5740
The answer is D.
Question: Find the roots of the quadratic equation: x2 + 2x - 15 = 0?
A.-5, 3
B.3, 5
C.-3, 5
D.-3, -5
Answer: A.-5, 3
Explanation: Explanation:
x2 + 5x - 3x - 15 = 0
x(x + 5) - 3(x + 5) = 0
(x - 3)(x + 5) = 0
=> x = 3 or x = -5.
ANSWER IS A
Question: Which of the following is not a perfect square of an integer?
A.64
B.529
C.441
D.450
Answer: D.450
Explanation: A. 8*8=64
B.23*23=529
C.21*21=441
D.22*22=484
Here 450 is not a square of an integer
so answer is D
Question: A man has Rs. 560 in the denominations of one-rupee notes, five-rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has ?
A.33
B.105
C.37
D.90
Answer: B.105
Explanation: Let number of notes of each denomination be x.
Then x + 5x + 10x = 560
⇒ 16x = 560
∴ x = 35.
Hence, total number of notes = 3x = 105
Answer:B
Question: How many multiples of 3 are there between 81 and 358?
A.94
B.95
C.93
D.97
Answer: C.93
Explanation: 3 * 27 = 81
3 * 119 = 357
Total multiples of 3 = (119 - 27) + 1
= 93
Answer is C.
Question: At what price must an article costing Rs.47.50 be marked in order that after deducting 5% from the list price. It may be sold at a profit of 25% on the cost price?
A.62.5
B.69.5
C.67.5
D.62.5
Answer: A.62.5
Explanation: CP = 47.50
SP = 47.50*(125/100) = 59.375
MP*(95/100) = 59.375
MP = 62.5
Answer:A
Question: Population is 21000. Population increases by 10% every year, then the population after 3 years is?
A.26630
B.27951
C.36621
D.26621
Answer: B.27951
Explanation: population after 1st year = 21000*10/100 = 2100 ===> 21000+2100 = 23100
population after 2nd year = 23100*10/100 = 2310 ===> 23100+2310 = 25410
population after 3rd year = 254100*10/100 = 2541 ===> 25410+2541 = 27951
ANSWER:B
Question: If Leo gains 10 pounds, he will weigh 50% more than his sister Kendra. Currently their combined weight is 150 pounds. What is Leo's current weight?
A.80
B.86
C.92
D.98
Answer: B.86
Explanation: L+K = 150 and so K = 150-L
L+10 = 1.5K = 1.5(150-L)
2.5L = 215
L = 86
The answer is B.
Question: A man can row 6 kmph in still water. When the river is running at 1.2 kmph, it takes him 1 hour to row to a place and black. How far is the place?
A.2.89
B.2.88
C.2.86
D.2.82
Answer: B.2.88
Explanation: M = 6
S = 1.2
DS = 6 + 1.2 = 7.2
US = 6 - 1.2 = 4.8
x/7.2 + x/4.8 = 1
x = 2.88.Answer: B
Question: A rectangular field is to be fenced on three sides leaving a side of 30 feet uncovered.If the area of the field is 600 sq.ft, how many feet of fencing will be required ?
A.70feet
B.52feet
C.32feet
D.12feet
Answer: A.70feet
Explanation: Explanation:
We are given with length and area, so we can find the breadth.
as Length * Breadth = Area
=> 30 * Breadth = 600
=> Breadth = 20 feet
Area to be fenced = 2B + L = 2*20 + 30
= 70 feet
Answer: Option A
Question: Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is:
A.80
B.85
C.90
D.95
Answer: B.85
Explanation: Let three numbers are a, b and c.
Given:
The product of a and b is 551.
The product of b and c is 1073.
b is common in both the product
b = H.C.F. of 551 and 1073 = 29;
a = (551/29) = 19.
c = (1073/289) = 37.
The sum of three number is 85.
answer :B
Question: x and y are integers. x + y < 11 , and x > 6. What is the smallest possible value of x - y ?
A.1
B.2
C.4
D.-2
Answer: C.4
Explanation: Because x & y are integers, the two equations can be simply written as :
x+y<= 10 --- eq. 1
x>= 7 ---- eq. 2
For smallest value of x-y, x has to be the smallest whereas y has to be the largest.
From the above eq. 2, smallest value of x = 7
Plugging it in eq. 1: 7+y<=10, or y<=3
Therefore, largest value of y=3 & smallest values of x=7
x-y = 7 - 3 = 4
Answer is C
Question: The product of two numbers is 120 and the sum of their squares is 289. Find the sum?
A.23
B.20
C.15
D.26
Answer: A.23
Explanation: Nos A and B
AB=120 and A2+B2=289
(A+B)2=529
A+B=Root(529)=23
ANSWER A
Question: In a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 7 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. Which of the following gives the dealer's price per gallon d in terms of the price per gallon p charged at the pump?
A.d = p/1.07 - 0.18
B.d = p-0.25
C.d= (p-0.18)/1.07
D.d = p/1.25
Answer: C.d= (p-0.18)/1.07
Explanation: Let dealers price (d) be 1. so adding 7% to dealers price is d+ 7% of d. i.e. 1 + 7% of 1 which is1 + 0.07. then add 0.18 to the value.
Now 1.07 + 0.18. this is now 1.25. you have the gasoline stations price (p) as 1.25 dollars.
Now sub 1.25 in the options to know which option gave you d = 1. d must equal 1 because you earlier picked 1 as the value of d in the question.
PS: always remember to start from E upwards.
Answer : C
Question: Each of the three people individually can complete a certain job in 3, 5, and 6 hours, respectively. What is the lowest fraction of the job that can be done in 1 hour by 2 of the people working together at their respective rates?
A.4/15
B.7/30
C.11/30
D.7/18
Answer: C.11/30
Explanation: The two slowest people work at rates of 1/5 and 1/6 of the job per hour.
The sum of these rates is 1/5 + 1/6 = 11/30 of the job per hour.
The answer is C.
Question: Machine–A produces 40% of the total output and Machine-B produces 60% of the total output. An average of nine units out of a thousand goods manufactured by Machine-A and one unit of 300 units produced by Machine-B prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?
A.a. 0.56
B.b. 0.056
C.c. 0.0056
D.d. 0.00056
Answer: C.c. 0.0056
Explanation: Let total Production be 10000 units....
A produces 4000 units and 36 units are defective
B produces 6000 units and 20 units are defective
So, Out of total 10,000 units 56 units are defective...
So the required probability = 56/10000 => 0.0056
Answer will be (C)
Question: Find large number from below question The difference of two numbers is 1515. On dividing the larger number by the smaller, we get 16 as quotient and the 15 as remainder
A.1209
B.1615
C.1245
D.1300
Answer: B.1615
Explanation: Let the smaller number be x. Then larger number = (x + 1515).
x + 1515 = 16x + 15
15x = 1500
x = 100
Large number = 100+1515 = 1615
Answer : B
Question: A man can row his boat with the stream at 6 km/h and against the stream in 4 km/h. The man's rate is?
A.1 kmph
B.5 kmph
C.2 kmph
D.9 kmph
Answer: A.1 kmph
Explanation: DS = 6
US = 4
S = ?
S = (6 - 4)/2
= 1 kmph
Answer: A
Question: Bob invested one half of his savings in a bond that paid simple interest for 2 years and received $450 as interest. He invested the remaining in a bond that paid compound interest (compounded annually) for the same 2 years at the same rate of interest and received $605 as interest. What was the annual rate of interest?
A. 68%
B. 10%
C. 12%
D. 15%
Answer: A. 68%
Explanation: First divide $450/2years to get 225$/yr non-compounding interest.
Next, subtract from the total compound after 2 years to see the interest gained in the second year. This can be done because the same amount has been invested in both accounts and the interest gained for the first year will be the same. So, $605-$225= $380.
To find the difference in interest gained, $380-$225= $155 increase in interest after the first year through compounding.
From this information we can set up the equation $225 * X% = $155=68% giving us answer choice A.
Question: Suppose 8 monkeys take 8 minutes to eat 8 bananas. How many monkeys would it take to eat 48 bananas in 48 minutes
A.5 monkeys
B.6 monkeys
C.7 monkeys
D.8 monkeys
Answer: D.8 monkeys
Explanation: 8 monkeys take 8 minutes to eat 8 bananas means each monkey takes 8 min for 1 banana
in 48 mins one monkey can eat 6 bananas....which means that 8 monkeys can eat 48 bananas in 48 minutes
so answer is 8 monkeys
ANSWER:D
Question: How many odd 4-digit positive integers E that are multiples of 5 can be formed without using the digit 3?
A.648
B.729
C.900
D.1296
Answer: A.648
Explanation: I choose A.
Possible n° of 1st digit: 8 (0 can't be the first number, or else it wouldn't have 4 digits. 3 is exlcuded)
Possible n° of 2nd digit: 9 (3 is excluded)
Possible n° of 3rd digit: 9 (3 is excluded)
Possible n° of 4th digit: 1 (a number is a multiple of 5 if it ends in 5 or 0, here we are asked for the odd numbers, hence the last digit can't be 0)
So, E=8*9*9*1=648 (A)
Question: The average age of a husband and his wife was 23 years at the time of their marriage. After five years they have a one-year old child. The average age of the family now is
A.12 years
B.27 years
C.19 years
D.18 years
Answer: C.19 years
Explanation: Sum of the present ages of husband, wife and child
= (23 * 2 + 5 * 2) + 1 = 57 years.
Required average = (57/3) = 19 years.
Answer: C
Question: A person buys an article at Rs.460. At what price should he sell the article so as to make a profit of 18%?
A.542
B.882
C.772
D.662
Answer: A.542
Explanation: Cost price = Rs.460
profit = 18% of 460 = Rs.82
Selling price = Cost price + Profit
= 460 + 82 = 542
Answer: A
Question: The number of boxes in a warehouse can be divided evenly into 12 equal shipments by boat or 32 equal shipments by truck. What is the smallest number of boxes that could be in the warehouse?
A. 27
B. 33
C. 96
D. 81
Answer: C. 96
Explanation: Answer is the LCM of 12 and 32
= 96
Answer C
Question: If P(A) = 3/5 and P (B) = 2/5, find P (A n B) if A and B are independent events.
A.6/25
B.3/25
C.8/25
D.2/13
Answer: A.6/25
Explanation: P (A n B) = P(A) . P(B)
P (A n B) = 3/5 . 2/5
P (A n B) = 6/25.
A
Question: Suppose you work for a manufacturing plant that pays you $12.50 an hour plus $0.16 for each widget you make. How many widgets must you produce in a 40 hour week to earn $580 (before payroll deductions)?
A.400
B.500
C.600
D.700
Answer: B.500
Explanation: total pay = 40*$12.50 + $0.16*x = 580
x = 80 / 0.16 = 500
The answer is B.
Question: By the how much is two-fifth of 200 greater than three -fifths of 125?
A.15
B.3
C.5
D.30
Answer: C.5
Explanation: Reqd no. = 2⁄5 × 200 - 3⁄5 × 125
= 80 - 75 = 5
Answer C
Question: The respective heights and volumes of a hemisphere and a right circular cylinder are equal, then the ratio of their radii is :
A.1.225
B.2.225
C.3.225
D.1.825
Answer: A.1.225
Explanation: Height of hemisphere = radius of hemisphere = Height of right circular cylinder = h
and
radius of right circular cylinder = r , then
(2/3)* pi*h^3 = pi*(r^2)*h
h/r = Root (3/2) = root 1.5 = 1.225
ANSWER:A
Question: Find the odd man out. 187, 264, 386, 473, 682, 781
A.386
B.187
C.781
D.682
Answer: A.386
Explanation: Explanation :
In all numbers except 386, the middle digit is the sum of other two digits. Answer : Option A
Question: The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 16. What is the middle number?
A.27
B.29
C.36
D.34
Answer: C.36
Explanation: The total of seven numbers = 7X18 = 126
The total of first 3 and last 3 numbers is = 3 X 14+3 X 16 = 90
So, the middle number is (126 - 90 ) = 36
C
Question: The salary of Mr. X is 30% more than that of Mr. Y . Find what percent of Mr. Y’s salary is less than Mr. X’s?
A.23 1/8%
B.23 8/3%
C.23 1/3%
D.28 1/3%
Answer: C.23 1/3%
Explanation: y=100	x=130
130---------30
100---------? => 23 1/3%
Answer:C
Question: If 11 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?
A.11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
B.10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
C.11 × 10
D.55
Answer: D.55
Explanation: Total number of handshakes = C112=11∗10/2=55
Answer: D
Question: A reduction of 22% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg?
A.s.2.82
B.s.2.4
C.s.2.5
D.s.2.2
Answer: A.s.2.82
Explanation: 100*(22/100) = 22 --- 10
? --- 1 => Rs.2.2
100 --- 78
? --- 2.2 => Rs.2.82
Answer:A
Question: Source: Knewton
A cyclist's speed varies, depending on the terrain, between 6.0 miles per hour and 13.0 miles per hour, inclusive. What is the maximum distance, in miles, that the cyclist could travel in 7 hours?
A. 42
B. 56
C. 70
D. 91
Answer: D. 91
Explanation: We are told that:generallya cyclist's speed varies, depending on the terrain, between 6.0 miles per hour and 13.0 miles per hour, inclusive. Is it possible the cyclist to travel with maximum speed for some time? Why not, if there is right terrain for that. So, if there is long enough terrain for the maximum speed of 13 mph then the maximum distance, in miles, that the cyclist could travel in 7 hours would be 7*13=91 miles.
Answer: D.
Question: There are 400 female managers in a certain company. Find the total number of female employees in the company, if 2/5 of all the employees are managers and 2/5 of all male employees are managers.
A.800
B.900
C.1000
D.1100
Answer: C.1000
Explanation: as per question stem 2/5M (Portion of Men employees who are managers) + 400 (Portion of Female employees who are managers) = 2/5T (Portion of Total number of employees who are managers), thus we get that 2/5M+400= 2/5T, or 2/5(T-M)=400, from here we get that T-M=1000, that would be total number of female employees and the answer (C)
Question: If a rectangular billboard has an area of 104 square feet and a perimeter of 42 feet, what is the length of each of the shorter sides?
A.4
B.7
C.8
D.13
Answer: C.8
Explanation: Assume the sides to be x and y.
Perimeter = 2x + 2y = 42
Hence x + y = 21 - (i)
Area = xy = 104 - (ii)
Since these are the sides of a billboard, we are dealing with positive numbers only and the options tell us that they are integers.
104 can be written as a product of two numbers as 104*1 or 52*2 or 26*4 or 13*8
Of these, only 13*8 satisfies the equation (i)
Hence the lengths are 13 and 8
Length of shorter side = 8
ANSWER:C
Question: Two trains travelling in the same direction at 50 and 40 kmph completely pass off another in 1 1/2 minute. If the length of the first train is 125 m, what is the length of the second train?
A.300 m
B.287 m
C.125 m
D.250m
Answer: C.125 m
Explanation: RS = 50 â€“ 40 = 10 * 5/18 =25/9 mps
T = 90 sec
D = 25/9 *90 = 250 m
125
--------
125 m
Answer: C
Question: The function f is defined by subtracting 25 from the square of a number and the function s is defined as the square root of one-half of a number. If s(f(x))=10, then which of the following is a possible value of x?
A.-15
B.-5
C.0
D.5
Answer: A.-15
Explanation: f(x) = x^2-25
s(x) = sqrt(x/2) not sqrt(x)/2, because the question clearly says its square root of (half of the number).
s(f(x)) = 10
s(x^2-25) =10
sqrt((x^2-25)/2) = 10
=> (x^2-25)/2 = 100
=>x^2 = 225
=> x = 15 or -15
Answer is A.
Question: A train 150 m long is running with a apecd of 68 kmph. In what time will it pass a man who is running at 8 kmph in the same direction in which the train is going?
A.6 sec.
B.7 sec.
C.9 sec.
D.11 sec.
Answer: C.9 sec.
Explanation: Solution
Speed of the train relative to man	=( 68 - 8 )
= 60 Kmph
= 60 x 5 / 18
=50/3 m/sec.
Time taken by it to cover 150 m at (50 /3)m/sec	= (112 - 50)kmph
= (150 x 3/50)sec
= 9 sec.
Answer C
Question: If 30% of the 880 students at a certain college are enrolled in biology classes, how many students at the college are NOT enrolled in a biology class?
A.110
B.616
C.550
D.430
Answer: B.616
Explanation: Students enrolled in biology are 30% and therefore not enrolled are 70%. so of 880 is 880*.7 = 616
Answer is B 616
Question: A rectangular tiled patio is composed of 96 square tiles. The rectangular patio will be rearranged so that there will be 2 fewer columns of tiles and 4 more rows of tiles. After the change in layout, the patio will still have 96 tiles, and it will still be rectangular. How many rows are in the tile patio before the change in layout?
A.5
B.6
C.8
D.13
Answer: C.8
Explanation: Suppose there are c columns and there are r rows
Original Situation
So, Number of tiles = c*r = 96
Also. Reach column has r tiles and each row has c tiles
New Situation
Number of tiles in each column is r-2 and number of tiles in each row is c+4
So, number of rows = r-2 and number of columns is c+4
So, Number of tiles = (r-2)*(c+4) = 96
Comparing both of them we get
c*r = (r-2)*(c+4)
=> 4r -2c = 8
c = 2r - 4
Putting it in c*r=96
(2r-4)*r = 96
2r^2 - 4r - 96=0
r cannot be negative so r = 8
and c = 12
So, Answer will be C
Question: If M is the least common multiple of 90,196, and 300, which of the following is NOT a factor of M?
A.600
B.700
C.900
D.2,100
Answer: A.600
Explanation: first calculate the LCM of the given numbers
90 = 2*3*3*5
196=2*2*7*7
300=2*2*3*5*5
LCM = 2*2*3*3*5*5*7*7 this is the number M.
now check each number whether a factor of M.
Answer A is 600.
Question: A watch was sold at a loss of 10%. If the watch was sold for $12 more, there would have been a gain of 6%. What is the cost price?
A.$55
B.$65
C.$75
D.$85
Answer: C.$75
Explanation: 0.9x + 12 = 1.06x
0.16x = 12
x = 75
The answer is C.
Question: The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%?
A.16 2/7%
B.16 2/6%
C.16 2/3%
D.16 9/3%
Answer: C.16 2/3%
Explanation: 10 CP = 12 SP
12 --- 2 CP loss
100 --- ? => 16 2/3%
Answer:C