Multiple choice

A group of 30 men can do a piece of work in 20 days. If 5 men leave the work after 5 days, how many days will the rest of the men take to complete the work?

  1. 20

  2. 24

  3. 18

  4. 16
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total work is 30 men * 20 days = 600 man-days. After 5 days, 30 men have done 30*5 = 150 man-days of work. Remaining work is 600 - 150 = 450 man-days. With 25 men left, time taken = 450 / 25 = 18 days.

AI explanation

Using the man-days formula, the total work is 30 men times 20 days, or 600 man-days. In the first 5 days, the 30 men complete 150 man-days of work, leaving 450 man-days. With 5 men leaving, 25 men remain to finish the job. Dividing the remaining 450 man-days by the 25 remaining men gives 18 days.

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