Question

A can do workin 15 days and b in 20 days if they work on it together for 4 days then the fraction of the work that is left is

Answer 1

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Q: A and B together can finish a piece of workin 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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A and B do a work in 12 days

(A and B) 's one day work = 1/12

A alone do a work in 20

A' s one day work = 1/20

Now,

B' s one day work =

(1/12) - (1/20)

= (5 - 3)/60

= 2/60

= 1/30

Hence,

B alone can finish it in 30 days