Selected MCQ

Current Question
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 1
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 2
If X and Y complete a work in 10 days and Y and Z in 16 days, and X and Z in 22 days, how long does each take?
  • A. 120, 40, 60 days
  • B. 120, 60, 80 days
  • C. 40, 30, 120 days
  • D. 30, 40, 60 days
Correct Answer: A
Explanation:
Solving simultaneous equations gives values.
Related Question 3
If 12 men can complete a work in 8 days, 16 men will complete in ____.
  • A. 6 days
  • B. 8 days
  • C. 10 days
  • D. 12 days
Correct Answer: A
Explanation:
Inverse proportion → (12×8)/16 = 6.
Related Question 4
A man can complete a work in 12 days. He works for 4 days. Remaining work is ____.
  • A. 1/2
  • B. 1/3
  • C. 2/3
  • D. 3/4
Correct Answer: C
Explanation:
Work done = 4/12 = 1/3 → remaining = 2/3.
Related Question 5
If Q alone does work in 12 days and P is twice as fast, time together is ____.
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Correct Answer: D
Explanation:
The combined rate gives 4 days.