Acan do a piece of work in 25 days and b can finish it in 20 days. they work together for 5 days, then a leaves. in how many days will b finish the work? ?

If A can do a piece of work in 25 days, then he can do of all work per day.

If B can finish work in 20 days, then he can do of all work per day.

Together per day they can do

of all work.

They work together for 5 days, then the work done after these 5 days is

of all work.

If then B finishes alone, it is left for him

of all work.

Since B can do of all work per day, then of all work he can do in 11 days.

B will finish the work in 11 days.

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