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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Answer:
the fraction is left 8/15
Step-by-step explanation:
a+b=1/15+1/20
=4+3/60
=7/60
4 days work=7/60*4
=7/15
remaining =1-7/15
=8/15
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