75 men working 8 hours per day dig 50 m deep. How many extra men should be put to dig to a depth of 70 m working 6 hours per day?	Choose the most appropriate option:
A) 75  B) 45  C) 55  D) 65  E) 35
(75 * 8)/50   = (x * 6)/70   =&gt; x =140   140 â€“ 65   = 65   Answer: 65
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75 men working 8 hours per day dig 50 m deep. How many extra men should be put to dig to a depth of 70 m working 6 hours per day?