25 persons can complete a work in 60 days. They started the work. 10 persons left the work after x days. If the whole work was completed in 80 days, then whatis the value of x ?
Total work = man $$\times days = 25 \times 60$$ = 1500
25 person work for x days and 15 person work for (80 - x) days.
$$25 \times x +Â 15 \times (80 - x) = 1500$$
25x + 1200 - 15x = 1500
10x = 300
x = 30
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