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To do a certain work, the ratio of the e...

To do a certain work, the ratio of the efficiencies of X and Y is 5:4. Working together, they can complete the same work in 10 days. Y alone starts the work and leaves after 5 days. The remaining work will be completed by X alone in :

A

12 days

B

14 days

C

10 days

D

15 days

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The correct Answer is:
B
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