# A and b together can finish a piece of work in 12 days. if a alone can finish the same work in 20 days, in how many days b alone can finish it?

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by dolls

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by dolls

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1 day ------------------- 1/12th part of work can be done

A works 20 days to finish total work

then for

1day------------------- 1/20th part of work can be done by A alone

1/12=1/20+x

find the value of x

you would get the work done by B in one day

(answer =1/30

B works alone for 30 days)