Question : X alone can complete a piece of work in 16 days, while Y alone can complete the same work in 24 days. They work on alternate days starting with Y. In how many days will 50% of the total work be completed?
Option 1:
Option 2:
Option 3:
Option 4: 9 days
Correct Answer:
Solution :
Time taken by X to complete the work = 16 days
Part of work done by X in a day =
Time taken by X to complete the work = 24 days
Part of work done by X in a day =
Part of work done by X and Y in 2 days =
Part of work done by X and Y in 8 days =
Part of work done by Y in 9th day =
Remaining work =
Time taken by X to do the remaining work =
Total time taken =
Hence, the correct answer is