a can do a work in 12 days and b in 18 days. if they work on it together for 4 days then the fraction of the work that is left is :
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Given, A can do work in = 12 days
B can do work in = 18 days
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A's 1 day work = 1/12
B's 1 day work = 1/18
1 day work of A and B together = 1/12 + 1/18
= (3+2) / 36 = 5/36
Work completed by A and B together in 4 days = 4 x 5/36
= 5/9
Work remaining = 1 - 5/9 = 4/9
Hence fraction of work that is left is 4/9
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