31 men can complete a work in 29 days. If 39 men work at the same rate, how many days are required? MCQ with Answer and Explanation

31 men can complete a work in 29 days. If 39 men work at the same rate, how many days are required?

A. 25.55

B. 28.05

C. 30.55

D. 23.05

Answer: Option D

Total work = 899 man-days. Days = 23.05.

This question belongs to: Maths Time and Work

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Question #1 Report Error

A can complete a work in 30 days. What percentage of work will A complete in 6 days?

A. 20.0

B. 35.0

C. 30.0

D. 25.0

Correct Answer: Option A

Explanation:
Percentage completed = (6/30) × 100 = 20.0%.

This question belongs to: Maths Time and Work

Question #2 Report Error

8 men can complete a work in 18 days. If 12 men work at the same rate, in how many days will the work be completed?

A. 14.0

B. 18.0

C. 16.0

D. 12.0

Correct Answer: Option D

Explanation:
Total work = 8 × 18 = 144 man-days. Required days = 144/12 = 12.0 days.

This question belongs to: Maths Time and Work

Question #3 Report Error

A can complete a work in 12 days and B in 14 days. If they work together, the work will be completed in:

A. 16.46

B. 21.46

C. 11.46

D. 6.46

Correct Answer: Option D

Explanation:
Combined rate = 1/12 + 1/14. Required time = 6.46 days.

This question belongs to: Maths Time and Work