- A9
- B16
- C7
- D8
Step-by-Step Solution
Combined rate = 1/12 + 1/18 = 5/36 per day. In 4 days they finish 20/36 = 5/9, leaving 4/9. B alone finishes it in (4/9) ÷ (1/18) = 8 days.
Answer: D) 8
A can do a work in 12 days and B in 18 days. They work together for 4 days, then A leaves. In how many more days will B finish the remaining work?
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