A can do a piece of work in 30 days. he works at it for 5 days and then b finishes it in 20 days. in what time can a and b together it?
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work done by A in 5 days = 1/30*5
=1/6
remaining work=(1-1/6)
=3/4
now,3/4 work is done by B in 20 days
whole work will be done by B in 20*4/3= 80/3 days
as 1 day's work of A = 1/30
1 day's work of B =3/60
(A+B)'s 1 day's work= 1/30+3/60
=1/6
remaining work=(1-1/6)
=3/4
now,3/4 work is done by B in 20 days
whole work will be done by B in 20*4/3= 80/3 days
as 1 day's work of A = 1/30
1 day's work of B =3/60
(A+B)'s 1 day's work= 1/30+3/60
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