A and B can do a work in 12 days B and C can do it in 15 days C and A can do it in 20 days. Then the number of days required to complete the work A,B,C together is ?->(Show Answer!)

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1. A and B can do a work in 12 days B and C can do it in 15 days C and A can do it in 20 days. Then the number of days required to complete the work A,B,C together is

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