A can do a work in 15 days and B in 20 days. If they work on it together for 4 days than the fraction of the work that is left is what
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Step-by-step explanation:
One day work of A = 1/15
One day work of B = 1/20
One day work of (A+B) together
= 1/15 + 1/20
= 7/60
Work done in 4 days by them together = 7/60 * 4
= 7/15
Work left = 1 - Work done
= 1 - 7/15
= 8/15
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