If 12 workers can build a wall in 15 days, working 6 hours per day, then in how many days can 10 workers build two such walls, if they work for 4 hours per day?
54 days
Use \(\frac{M_1 D_1 H_1}{W_1}=\frac{M_2 D_2 H_2}{W_2}\), where M = workers, D = days, H = hours per day and W = work.
Work in one wall: \(12\times15\times6=1080\) worker-hours. Two walls need \(2\times1080=2160\) worker-hours.
With 10 workers at 4 hours per day: \(D_2=\frac{2160}{10\times4}=54\) days.
Hence, the answer is 54 days.
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