10 men working 8 hours day can do a work in 30 days. In how many days will 12 men working 4 hours a day take do the same work?
apply chain rule
M1 D1 H1 =M2 D2 D2
$$10 \times 8\times 30$$=$$12 \times 4\times D2 $$
= 50 days
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