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A can do a work in 16 days and B in 24 days. A works every day, but B helps only on every second day. In how many days is the work finished?

Competition practiceTime & Work / Pipes

A9 3/5 days
B10 days
C14 days
D12 days

Step-by-Step Solution

Each 2-day block: A

2 \times \frac{3}{48}

plus B once

\frac{2}{48} = \frac{8}{48} = \frac{1}{6}

. Six blocks: 12 days.

Answer: D) 12 days

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