If 40 men working 12 hours a day can complete a work in 8 days, then how many men working 4 hours a day can complete the same work in 16 days?
$$M1\times D1\times H1=M2\times D2\times H2$$
$$40\times 8\times 12=M2\times 16\times 4$$
$$M2= 60 $$
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