Ex.8 Kshitij can do a piece of work in 20 days and
Rohan can do the same work in 15 days. They
work together for 5 days and then Rohan
leaves. In how many days will Kshitij alone
finish the remaining work?
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Work done by Kshitij in one day is 1/20
Work done by Rohan in one day is 1/15
Work done by Kshitij and Rohan in one day is 1/20+1/15 = 7/60
Work done by both of them in 5 days is 7/60 * 5 = 7/12
Remaining work is 1-7/12 = 5/12
Kshitij finishes the work in 5/12 * 20 = 8 1/3 days
Work done by Rohan in one day is 1/15
Work done by Kshitij and Rohan in one day is 1/20+1/15 = 7/60
Work done by both of them in 5 days is 7/60 * 5 = 7/12
Remaining work is 1-7/12 = 5/12
Kshitij finishes the work in 5/12 * 20 = 8 1/3 days
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