Discussion
If 10 men can do a piece of work in 12 days, how many men are needed to do the same work in 8 days?
Answer: B
The total work is fixed in man-days.
\[ 10 \times 12 = 120 \text{ man-days} \]
\[ \frac{120}{8} = 15 \text{ men} \]
Men and days are inversely proportional for a fixed job.
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