Answer-A and B can do a piece of work in 30 days and 40 days, respectively. They began the work together bu...

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Let, after x days A leave.  Let the total work is the 120 units LCM of 30 and 40  Efficiency of A is 120  30  4 units  The efficiency of B is 12040  3 units  So, after x days they both work together.  According to the question,  43 x x  25 x 3  120    7x  75  120  7x  45    x  457 days  637days.

A and B can do a piece of work in 30 days and 40 days, respectively. They began the work together but after a certain time, A leaves off and B completed the remaining work in 25 days. After how many days did A leave?

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