A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work? ?->(Show Answer!)

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1. A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

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By: guest on 01 Jun 2017 05.49 pm

Whole work is done by A in 20 x 5 = 25 days. 4 Now, 1 - 4 i.e., 1 work is done by A and B in 3 days. 5 5 Whole work will be done by A and B in (3 x 5) = 15 days. A's 1 day's work = 1 , (A + B)'s 1 day's work = 1 . 25 15 B's 1 day's work = 1 - 1 = 4 = 2 . 15 25 150 75 So, B alone would do the work in 75 = 37 1 days. 2 2

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