Selected MCQ

Current Question
12 children take 16 days to finish work. Time for the same work with a different number is ____.
  • A. 3 days
  • B. 4 days
  • C. 6 days
  • D. 8 days
Correct Answer: C
Explanation:
Work is inversely proportional.
Related Question 1
8 children and 12 men complete work in 9 days if each child takes twice time of a man, time required by men alone ____.
  • A. 6 days
  • B. 8 days
  • C. 10 days
  • D. 12 days
Correct Answer: D
Explanation:
Convert child efficiency to men.
Related Question 2
If P works alone takes same time as Q and R together, time taken by P is ____.
  • A. 30 days
  • B. 25 days
  • C. 20 days
  • D. 15 days
Correct Answer: B
Explanation:
Based on the equality of work rates.
Related Question 3
P completes work in 24 days, Q in 9 days, R in 12 days. Time taken together is ____.
  • A. 10
  • B. 9
  • C. 11
  • D. 12
Correct Answer: A
Explanation:
Sum of rates gives time = 10 days.
Related Question 4
Kamal completes work in 20 days. Suresh is 25% more efficient. Time taken by Suresh is ____.
  • A. 14
  • B. 16
  • C. 15
  • D. 11
Correct Answer: B
Explanation:
Efficiency ↑25% → time = 20/1.25 = 16 days.
Related Question 5
C completes half the work in 6 days, D completes 1/3 in 5 days. Total time taken?
  • A. 10 days
  • B. 12 days
  • C. 8 days
  • D. 9 days
Correct Answer: A
Explanation:
Combined rates calculation.