A can do a work in 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 :
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uppose 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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