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A does half as much work as B, and C doe...

A does half as much work as B, and C does half as much work as A and B together. If C alone can finish the work in 40 days, then all together will finish the work in (B) 15 days (A) `13(1/3)` days (D) 30 days (C) 20 days

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The correct Answer is:
`13(1)/(3)` days
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