36 persons working 8 hours a day can do 3 units of work in 12 days. How many persons are required to do 5 units of that work in 16 days, if they work for 6 hours a day?
Now Always remember MDH/W is constant where W is work so equating for both we get :
$$\frac{36\times\ 8\times\ 12}{3}=\frac{M\times\ 16\times\ 6}{5}$$
Solving we get M=60 men
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