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A and B can do a work in 12days,B and C in 15days,C and A in 20days.If A,B and C work together ,They will complete the work in:

A and B can do a work in 12days,B and C in 15days,C and A in 20days.If A,B and C work together ,They will complete the work in: Correct Answer 10Days

(A + B) can do in 1 day = 1/12 th of the work (B + C) can do in 1 day = 1/15 th of the work (C + A) can do in 1 day = 1/20 th of the work So, In 1 day 2 (A + B + C) can do ( 1/12 + 1/15 + 1/20) portion = ( 5 + 4 + 3)/60 portion = 12/60 portion = 1/5 portion In 1 day( A + B + C) can do = 1/(5×2) portion = 1/10 portion (A + B + C) can do 1/10 portion in 1 day " " " 1 " " = 1×10 day = 10 days

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