A and B can do a piece of work in 60 days and 75 days respectively. Both begins together but after a certain time, A leaves off. In such case, B finishes the remaining work in 30 days. After how many days did A leave?

Continue ReadingA and B can do a piece of work in 60 days and 75 days respectively. Both begins together but after a certain time, A leaves off. In such case, B finishes the remaining work in 30 days. After how many days did A leave?