- A15
- B18
- C12
- D20
Step-by-Step Solution
A does 4/10 = 2/5 in 4 days, leaving 3/5. B does 3/5 in 9 days, so B's rate = 1/15; B alone takes 15 days.
Answer: A) 15
A can complete a work in 10 days. He works for 4 days and then leaves. B completes the remaining work in 9 days. How many days would B alone take to do the whole work?
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