If A can do three/twenty
part of a work in one day, then he can finish the
whole work in days
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Therefore let the number of days taken to complete the whole work be x.
Therefore:
1: 1/20 :: x :20/20 ( Product of means =product of extremes)
x/20= 20/20
x=20/20*20
x=20 days
Therefore the answer = 20 days
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