A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?
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speed of A is 8/10 work in 20 days
in one day he will do 8/(10*20)
1/20work
A+B=3days and 2/10 work
in one day A+B=2/(10*3)
A+B=1/15
1/20+x=1/15
x=1/15-1/20
x=4-3/60
x=1/60
speed os x is 1/60 per day
so we will need 60 days to finish the work
in one day he will do 8/(10*20)
1/20work
A+B=3days and 2/10 work
in one day A+B=2/(10*3)
A+B=1/15
1/20+x=1/15
x=1/15-1/20
x=4-3/60
x=1/60
speed os x is 1/60 per day
so we will need 60 days to finish the work
LordRaghav:
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ans:37 1/2
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