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A and B will complete a task in 20 days and l0 days respectively if they work alone. They begin working together and A leaves after a few days and B finishes the remaining job in 4 days. How many days did \”A\” work?
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Explanation:
During the last 4 days B works alone and finishes 4\10.
That is 2\5th of the work
A and B will be able to finish the remaining 3\5th of the work in
3\5[20×10\20+10]=3\5×20\3
= 4 days.
Therefore, after 4 days A leaves the work.