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If 4 men or 8 women can do a piece of work in 15 days, in how many days can 6 men and 12 women do the same piece of work ?
By mdh formula,
m1d1h1 = m2d2h2
$$\Rightarrow 4m \times 15 = 8w \times 15$$
$$\Rightarrow$$ 1 men = 2 women
(6m+ 12w) $$\times days = 4m \times$$ 15
$$\Rightarrow (6m+ 6m) \times days = 4m \times$$ 15
$$\Rightarrow$$ days = 5
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