Question
Ten men begin to do work. But after some days, four of
them left the job. As a result, the job that could have been completed in 40 days is completed in 50 days. How many days after the commencement of the work did the four men leave?Solution
Let 4 men leave after x days.  A.T.Q. - 10x + 6(50 – x) = 40 × 10  10x + 300 – 6x = 400 4x=100  x = 25 days
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