A can finish a work in 20 days and B can finish the same work in 25 days. They began together, but B left the work after 5 days. How many more days will A take to finish the remaining work?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e 11.
| Understanding/Application |
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In one day A can complete 1/25 of the work 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 i.e. = 9/20 work. |
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The 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. |