Chain Rule - Quantitative Aptitude (MCQ) questions

1)   If a tank can be build by 18 men in 28 days while working for 9 hours per day, how many hours per day do 21 men have to work for 36 days, to complete the same tank?
- Published on 12 Apr 17

a. 4
b. 5
c. 9
d. 6
Answer  Explanation 

ANSWER: 6

Explanation:
chain rule


2)   Rohan wants to build a tank in 20 days for which he hires 60 workers. After 10 days, he sees that only 30% work has been done. To speed up the process and get the tank built in stipulated time, how many workers should work on the tank?
- Published on 11 Apr 17

a. 80
b. 120
c. 200
d. 140
Answer  Explanation 

ANSWER: 140

Explanation:
chain rule


3)   A fort has provision for 42 days. After 10 days, a reinforcement of 200 men arrives and the food will now last only for 24 days. How many men were there in the fort in the beginning?
- Published on 11 Apr 17

a. 600
b. 575
c. 550
d. 520
Answer  Explanation 

ANSWER: 600

Explanation:
chain rule


4)   A tank has oxygen for 72 patients and can last for 54 hours for them. If patients reduce their oxygen consumption by 10%, then 90 patients can use this oxygen supply for how many hours?
- Published on 17 Mar 17

a. 24 hours
b. 48 hours
c. 36 hours
d. 42 hours
Answer  Explanation 

ANSWER: 48 hours

Explanation:
chain rule


5)   2500 children in a school had enough chocolates for 40 days. But some children never came to school and the chocolates lasted for 50 days. How many children never came to school?
- Published on 17 Mar 17

a. 700
b. 1000
c. 400
d. 500
Answer  Explanation 

ANSWER: 500

Explanation:
chain rule


6)   40 boys working 9 hours per day paint a house in 96 days. How many hours per day 48 boys need to work so they can paint the house in 45 days?
- Published on 15 Mar 17

a. 24
b. 16
c. 18
d. 27
Answer  Explanation 

ANSWER: 16

Explanation:
chain rule


7)   75 girls complete one-third decoration of a building in 40 hours. Now they have only 50 hours to complete the rest of the decoration. How many more girls are necessary to help them complete the task?
- Published on 15 Mar 17

a. 45 girls
b. 150 girls
c. 100 girls
d. 55 girls
Answer  Explanation 

ANSWER: 45 girls

Explanation:
chain rule


8)   20 fishermen can catch 20 fish in 20 minutes. As per this, how many fish can 400 fishermen catch in 6 hours 40 minutes?
- Published on 15 Mar 17

a. 8000
b. 4000
c. 20
d. 2000
Answer  Explanation 

ANSWER: 8000

Explanation:
chain rule


9)   12 pumps of one type pump 30 litres of water when each is running for 18 hours per day. But a set of 16 pumps of other type pump 40 litres of water when each is running for 24 hours per day. How efficient are former type of pumps than latter type?
- Published on 15 Mar 17

a. 4/3 times more efficient
b. 7/15 times more efficient
c. 3/4 times more efficient
d. 7/12 times more efficient
Answer  Explanation 

ANSWER: 4/3 times more efficient

Explanation:
chain rule


10)   Posters stuck by a child is equal to the half the posters stuck by an adult. 20 adults and 16 children can stick all posters in 10 days. When 8 adults and 12 children start working together, in what time will they stick all the posters?
- Published on 10 Mar 17

a. 20 days
b. 24 days
c. 40 days
d. 25 days
Answer  Explanation 

ANSWER: 20 days

Explanation:
chain rule


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