A does 7/10 of a piece of work in 15 days. He does the
remainder with the assistance of B in 4 days. In what
time could A and B together do it?
days
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A completes 7/10 of the work in 15 days
Remaining work = 1 - 7/10 = 3/10
A+B take 4 days to complete the remaining work, 3/10 of the work
So, for the entire work, A+B will take 4 * (10/3) days
=40/3 days = 13.33 Days
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