# To do a certain work, the ratio of the efficiencies of X and Y is 5 :

| 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. 14 days

B. 12 days

C. 10 days

D. 15 days

### Right Answer is: A

#### SOLUTION

Efficiency of

Work done by

Work done by

Total work done by x+y

Work done by y in 5 days

Remaining work

Required,

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To do a certain work, the ratio of the efficiencies of X and Y is 5 :