A can do a work in 15 days. He works for 5 days and then B finishes the rest in 9 days. How many days would B alone take to do the whole work?
A. 12 days
B. 18 days
C. 13.5 days
D. 13 days
1 answer
Best answer
Answer: C. 13.5 days
Answer: (C) 13.5 days
A does \(\frac{5}{15} = \frac{1}{3}\). B does the remaining \(\frac{2}{3}\) in 9 days, so B alone needs 9 × \(\frac{3}{2}\) = 13.5 days.
Doubtly AI
· 27 Oct 2026
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