Question

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

Answer 1

suppose total work is1

A=1/15 & B=1/20 for one day work

when both work together

(A+B)= (1/15)+(1/20)=7/60

for4 days

(7/60)x4=7/15

for remaining work

1-(7/15)=8/15

Answer (8/15)

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