- A28
- B21
- C18
- D42
Step-by-Step Solution
Combined rate = 1/14; A does 2/3 of the combined work, so A's rate = (2/3)(1/14) = 1/21; A alone takes 21 days.
Answer: B) 21
A is twice as efficient a worker as B. Working together, A and B can finish a piece of work in 14 days. In how many days can A alone finish the work?
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