A can do a work in 15 days and B in 20 days. if they work together how much work will be completed in 4 days
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Step-by-step explanation:
A can do the work in 15 days
=> A's one day work = 1/15
B can do the work in 20 days
=> B's one day work = 1/20
Together A and B 's one day work
= 1/15 + 1/20
= (4+3)/60
= 7/60
=> Together A and B can do the work in 60/7 days
Hope it helps
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