Chain Rule - Quantitative Aptitude (MCQ) questions

1)   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


2)   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


3)   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


4)   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


5)   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


6)   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


7)   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


8)   Ramesh and Suresh start cleaning a pool together. They do it in 26 days but for the last 6 days only Ramesh was working. When Suresh works alone, in how much time will he completely clean the pool, if Ramesh and Suresh together can clean the pool in 24 days?
- Published on 10 Mar 17

a. 36 days
b. 72 days
c. 52 days
d. 13 days
Answer  Explanation 

ANSWER: 72 days

Explanation:
chain rule


9)   4 women and 4 children start working together. How many days will they need to paint a house completely, if 3 women alone can paint the house in 18 days and 6 children too alone can do the same in 18 days?
- Published on 10 Mar 17

a. 6 days
b. 4.5 days
c. 27 days
d. 9 days
Answer  Explanation 

ANSWER: 9 days

Explanation:
chain rule


10)   In a palace, supplies are available for 35 days for only 75 people. 15 Guests arrive in the palace for vacation on day 1 itself. For how many days will these supplies be sufficient for all these people?
- Published on 05 Mar 17

a. 90 days
b. 11.25 days
c. 42 days
d. 22.5 days
Answer  Explanation 

ANSWER: 42 days

Explanation:
chain rule


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