A alone can do a work in 30 days, B alone in 40 days. They start together, but A leaves 5 days before the completion.
Total work is completed in 18 days. In how many days did A work?
Show answer & explanation
Correct answer: A
Explanation
Time taken to complete the total work = 18 days
A leaves the work 5 days before its completion.
Therefore, A worked for = 18 - 5 = 13 days.