Exams › SSC CGL (Prelims) › General

P can do a piece of work in 5 days, and Q can do it in 10 days. If they work together for 2 days, how much of the work will be left?

1. 20%
2. 30%
3. 40%
4. 50%

Correct answer: 40%

Solution

P’s one-day work = \(1/5\), Q’s one-day work = \(1/10\). Together they do \(1/5 + 1/10 = 3/10\) of the work per day, so in 2 days they complete \(6/10 = 60\%\). Hence, 40% work is left.

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