A completes 80% of a work in 20 days. then b also joins and a and b together finish the remaining work in 3 days. how long does it need for b if he alone completes the work?
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i am not sure but i feel its 22 days
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a completes 80/100 in 20 days
(a+b) completes 20/100 in 3 days
a completes 80/100/20 of the work in 1 day
=>4/100 in a day
in 3 days a finishes 12/100
so b has to finish 8/100 in 3days
=>b finishes 8/300 of the work in 1 day
=>it takes 1/8/300 =300/8 days to finish the work
(a+b) completes 20/100 in 3 days
a completes 80/100/20 of the work in 1 day
=>4/100 in a day
in 3 days a finishes 12/100
so b has to finish 8/100 in 3days
=>b finishes 8/300 of the work in 1 day
=>it takes 1/8/300 =300/8 days to finish the work
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