7. 2 A and B can independently finish a piece of work in 24 days and 40 days respectively. They started working together and after few days B left. After that A could finish the remaining work in 8 days. After how many days of working together B left ? 2) 5 1) 7 3) 10 4) 12 5) 8
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Answer:
A's one day work =136
B's one day work =145
∴ (A+B)'s one day work =136+145=5+4180=9180
Work done by B in 36day=3645
∴ Remaining work =1−3645=945
∴ Number of days A worked =945÷9180=945×1809=4
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