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 :