Question

A alone can complete a piece of work in 10 days and B alone can complete the same work in 15 days. They start the work together, and after some days A leaves. B completes the remaining work alone in a total of 9 days from the start. For how many days did A work?

A 2 days
B 4 days
C 8 days
D 10 days
E None of these
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