A can do a work in 15 days and b in 20 days. If they work on it together for 4 days, then what fraction of work is left
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Answer:
suppose total work is 1
A=1/15 & B=1/20 for one day work
when both work together
(A+B)= (1/15)+(1/20)=7/60
for 4 days
(7/60)x4=7/15
for remaining work
1-(7/15)=8/15
Answer (8/15)
Step-by-step explanation:
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