- A1/6
- B2/3
- C1/3
- D1/4
Step-by-Step Solution
Combined rate = 1/10 + 1/15 = 1/6 per day; in 4 days they do 4/6 = 2/3, so 1/3 is left.
Answer: C) 1/3
A can do a piece of work in 10 days and B can do it in 15 days. They work together for 4 days. What fraction of the work is left unfinished?
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