- A16
- B24
- C18
- D20
Step-by-Step Solution
Let B do 1 unit/day and A 2 units/day; together 3 units/day, so total work = 36 units. A alone = 36/2 = 18 days.
Answer: C) 18
A is twice as efficient as B. Working together they complete a piece of work in 12 days. In how many days can A alone complete the work?
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