A can do a piece of work in 15days. b can do the same work in 20 days.if they together work for 4 days then the fraction of the work left is?
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A 15 day work = 1
A 1 day work = 1/15
b 20 day work = 1
B 1 day work = 1/20
Together they work in 1 day
1/15 + 1/20 = 7/60
Together they work in 4 day
4 * 7/60 = 7/15
peice of work left
1 - 7/15 = 8/15
A 1 day work = 1/15
b 20 day work = 1
B 1 day work = 1/20
Together they work in 1 day
1/15 + 1/20 = 7/60
Together they work in 4 day
4 * 7/60 = 7/15
peice of work left
1 - 7/15 = 8/15
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