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A can do a piece of work in 25 days and B can finish it in 20 days. They work together for 5 days and then A goes away. In how many days will B finish the remaining work?
6 days
15 days
10 days
11 days
In one day A can complete 1/25 of the work. And.
In one day B can complete 1/20 of the work.
Together they can complete 1/25+ 1/20 work in one day.
Hence in 5 days they can complete 5/25 + 5/20 work. ie = 9/20 work.
Remaining work is 1–9/20 work= 11/20 work
Hence B can complete the remaining 11/20 work in 11/20 / 1/20=11 days.
Hence, option 4 is the correct answer.
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