Multiple choice

Ram can complete a piece of work in 15 days. He worked for 5 days and left. Mohan alone completed the remaining work in 20 days. How long would Mohan take to complete the whole work?

  1. 25

  2. 22

  3. 28

  4. 30

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ram's work rate: 1/15 per day. In 5 days, he completes 5 × (1/15) = 1/3 of the work. Remaining work = 2/3. Mohan completes 2/3 work in 20 days, so his rate is (2/3)/20 = 1/30 per day. Therefore, Mohan alone would take 30 days.

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