Question

A, B and C working together can finish a piece of work in 8 hours. A alone can d 20 hours and B alone can do it in 24 hours. In how many hours will C alone do the same work
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Answer 1

A+B+C = 80

A+B+C = 8020+24+C = 80

A+B+C = 8020+24+C = 80C= 8O-44

C=44