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A and B can finish a work in 20 days and 12 days respectively. A after working for 4 days, B joined with him. In how many days the complete work will be finished.
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Explanation:
A’s one day work = 1\20
A’s 4days work = 1\20×4=1\5 part
Remaining part = 1−1\5=4\5
B’s one day work = 1\12
(A+B)’s one day work = 1\20+1\12=8\60=2\15
4\5 part can be finished by A and B in
= 4\5×15\2 = 6 days
The complete work will be finished in 6+4 = 10 days.