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A and B can complete a piece of work in 15 days and 10 days respectively. They started doing the work together but after 2 days, B had to leave and A alone completed the remaining work. The whole work was completed in :
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Explanation:
work ofA+B=5×2=10 units
work left 30−10=20 units
A will complete this work in 20\2 = 10 days
Total time 10days+2 days
= 12 days