Selected MCQ

Current Question
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 1
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 2
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.
Related Question 3
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 4
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.
Related Question 5
If P is 30% more efficient than Q and P takes 23 days, Q takes ____.
  • A. 9
  • B. 11
  • C. 23
  • D. 13
Correct Answer: D
Explanation:
Q’s time = 23 × 1.3 = 30 approx.