If a , b , and c complete a work in 10, 12, 15 days respectively, and a and b leave the work 2 days before its completion of the work, how many days will it take c to finish the work
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15 will be the answer
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A. So, B takes (12/2) = 6 days to finish the work. A and B can complete a 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.
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