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 work that is left is mcq
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A can do a work in =15 days
A's 1 day's work=1/15
B's 1 day's work =1/20
(A+B)'s 1 day's work=1/15+1/20=7/60
----------4---------------=7/60×4=7/15
.°.Remaining work=1-7/15=8/15
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A's 1 day's work=1/15
B's 1 day's work =1/20
(A+B)'s 1 day's work=1/15+1/20=7/60
----------4---------------=7/60×4=7/15
.°.Remaining work=1-7/15=8/15
Plz mark this answer as brainliest i am in need of it
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