A and B can do a piece of work in 60 days and 40 days respectively. They started the work together but after some days, A left the work. B alone did the remaining work in 20 days. Find after how many

 A and B can do a piece of work in 60 days and 40 days respectively. They started the work together but after some days, A left the work. B alone did the remaining work in 20 days. Find after how many

A). 10 days

B). 12 days

C). 14 days

D). 16 days

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