By Poonam

Verified by Ajay Kumar

Sonu and Monu together can do a piece of work in 30 days. If Sonu is 20% less efficient than Monu, in how many days can Sonu, working alone, complete 40% of the work?

  1. 32 days

  2. 25 days

  3. 30 days

  4. 27 days

Answer: D

Solution

Let Monu's daily work rate be m. Sonu's rate is 0.8m. Thus, 1.8m=1/30, so Sonu's rate is 2/135 of the work per day. Time for 40% work = (2/5)/(2/135)=27 days.

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