# A and B can do it piece of work in 14 days and 21 days respectively. They start work together but 3days before completely work A leave it. In How many days work will be finish?

2
by Neelam27

Put my answer as best

(A+B) 1 day work =1/14+1/21=5/42 now, 3 days work 3*5/42,now remaining work =1-15/42=42-15/42=17/42 so b I day work =1/21 hence remaining days =21*17/42=17/2 now total no of days= 3+17/2=so final answer is 23/2 days i.e 11.5 days only

thx to all

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