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 ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 ie 14 days.
5 : 4 [9 × 10 = 90]
5 × 4 = 20 units
Remaining work = 90 - 20
= 70 units
= 70/5 = 14 days