If 36 men can do somework in 25 days, then in how many days will 15 men doit?
$$ 36 \times m \times 25 = 15 \times m \times x days $$
$$ x = \frac{36 \times m \times 25}{15 \times m } $$
$$ x = 12 \times 5 $$
    = 60
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