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A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. If A, B and C work together, they will complete the work in? |
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Answer» 10 DAYS (A + B)'s 1 day work = 1/12; (B + C)'s 1 day work = 1/15; (A + C)'s 1 day work = 1/20 Adding, we get: 2(A + B + C)'s 1 day work = (1/12 + 1/15 + 1/20) = 1/5 (A + B + C)'s 1 day work = 1/10 So, A, B and C TOGETHER can complete the work in 10 days. |
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