A and b can finish work in 35 days after 5/7 of work a leaves remaining work done by b the total work done by 90 days then a finish alone in how many days
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5/7 of the total work will be done in 35*5/7=25 days
Suppose the total work=35*7=245
Work done before living a=35*5=175
Work to be done=70
Thus, the efficiency of b=70/65=14/13
And efficiency of a =7-14/13=77/13
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