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A and B can do a piece of work in 72 day...

A and B can do a piece of work in 72 days, B andC can do it in 120 days andA andC can do it in 90 days. When A,B andC work together, how much work is finished by them in 3 days?
(A) `frac(1)(40)` (B) `frac(1)(30)` (C ) `frac(1)(20)` (D) `frac(1)(10)`

A

C

B

D

C

A

D

B

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