Selected MCQ

Current Question
If P does work in 15 days and Q in 20 days, their work ratio is ____.
  • A. 8/15
  • B. 7/15
  • C. 11/15
  • D. 2/11
Correct Answer: A
Explanation:
Ratio = inverse of time.
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 5 workers earn Rs. 500 in 10 days, 10 workers will earn ____.in 10 days?
  • A. Rs. 500
  • B. Rs. 1000
  • C. Rs. 1500
  • D. Rs. 2000
Correct Answer: B
Explanation:
Double workers → double earnings.
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 and B can do the work in 12 days, B and C in 15 days, and A and C in 20 days. All together can do it in ____.
  • A. 10 days
  • B. 8 days
  • C. 12 days
  • D. 15 days
Correct Answer: A
Explanation:
Combined rate = (sum of pair rates)/2.
Related Question 5
A and B can do the work in 10 days. B alone can do it in 15 days. A alone will take ____.
  • A. 20 days
  • B. 25 days
  • C. 30 days
  • D. 35 days
Correct Answer: C
Explanation:
A’s rate = 1/10 − 1/15 = 1/30.