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A and B can do a piece of work in 10 day...

A and B can do a piece of work in 10 days.B and C can do it in 12 days. A and C can do it in 15 days. How long will A take to do it alone?

A

(A) 24 days

B

(B) 20 days

C

(C) 40 days

D

(D) 30 days

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