A and b take 15 and 20 days respective;y. they woked for 4days and thn the fraction of works left was
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workdone by A and B together for 4 days =( A+B)s one days work ×4
= (1/15+1/20)4
=7/15
fraction of work left=1-7/15=8/15
= (1/15+1/20)4
=7/15
fraction of work left=1-7/15=8/15
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