A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in

Question

A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days. In how many days will A alone finish the job?

Options:

A . 48

B . 34(2/7)

C . 44

D . 45

Answer: Option A
(1/A)+(1/B) = (1/20) (1/B)+(1/C) = (1/30) (1/A)+(1/C) = (1/40) SOLVING THE THREE EQUATIONS,
A=48

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