1.

A can do a piece of work in 15 days and B in 20 days. How much time will they take to complete the work if they work on alternate days, starting with A ?

Answer»

17



 Work done by A in one day = 1/15
Work done by B in one day = 1/20
Total work done in 2 days = 1/15 + 1/20 = 4+3/60 = 7/60
Total work done in 16 days = 7/60 x 8 = 56/60 = 14/15,
REMAINING work = 1 - 14/15 = 1/15 and this can be done by A on the 17TH day.



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