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There are 24 men who can build a wall in 10 days. If the wall is to be built in 8 days, then how many additional men need to be employed?
The work equals $$24 \times 10 = 240$$ man-days. To finish in 8 days, $$\frac{240}{8} = 30$$ men are needed. So $$30 - 24 = 6$$ additional men are required.
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