- A18
- B16
- C20
- D24
Step-by-Step Solution
Let B do 1 unit/day and A do 2 units/day; together 3 units/day for 12 days = 36 units. A alone = 36 / 2 = 18 days.
Answer: A) 18
A is twice as efficient as B. Working together they finish a job in 12 days. How many days would A take to do the whole job alone?
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