Multiple choice

A piece of work is expected to be completed by 20 workers in 25 days. The work is started by 10 workers. Then, after every 5 days, 5 more workers join the work. In how many days will the work be completed?

  1. 20

  2. 25

  3. 30

  4. 35
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total work = 20 * 25 = 500 man-days. 10 workers for 5 days = 50. 15 workers for 5 days = 75. 20 workers for 5 days = 100. 25 workers for 5 days = 125. 30 workers for 5 days = 150. Total = 50+75+100+125+150 = 500. Total time = 5*5 = 25 days.

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