- A18
- B24
- C16
- D20
Step-by-Step Solution
Let B's rate be 1 unit and A's be 2 units; together 3 units/day for 12 days = 36 units of work, so A alone takes 36 / 2 = 18 days.
Answer: A) 18
A is twice as efficient as B, and together they can finish a work in 12 days. In how many days can A alone finish the work?
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