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Solutions
A and B can complete a work in 15 days.
It is given that they work together for 10 days.
Work finished by (A+B) in 10 days = 
Let total work = 3 unit
Work finished by (A+B) in 10 days = 2 unit
Work finished by (A+B) in 1 day =
unit………………..(1)
Remaining work = 3– 2 = 1 unit
A finishes the remaining work in 10 days
Work finished by A in 10 day = 1 unit
Work finished by A in 1 day =
unit…………………….(2)
Work finished by B in 1 day =
unit
⇒
unit work is done by B in 1 day.
⇒ 1 unit work is done by B in 
⇒ 3 unit work is done by B in 