A and b can together finish work in 30 days .they worked together for 20 days and then b left. after another 20 days, a finished the remaining work .in how many days a alone can finish the job?
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In 30days
A+B = 30 work
In 1 day
A+B = 1/30 work
(A + B)'s 20 day's work =(1/30) x 20 = 2/3
Remaining work =1 - (2/3) = 1/3
Now, the remaining work i.e., 1/3 is done by A in 20 days.
Therefore, the whole work will be done by A in (20 x 3) = 60 days.
A+B = 30 work
In 1 day
A+B = 1/30 work
(A + B)'s 20 day's work =(1/30) x 20 = 2/3
Remaining work =1 - (2/3) = 1/3
Now, the remaining work i.e., 1/3 is done by A in 20 days.
Therefore, the whole work will be done by A in (20 x 3) = 60 days.
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