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 correct choice from the following choices
A) 75 B) 45 C) 55 D) 65 E) 35

Rationale: ( 75 * 8 ) / 50 = ( x * 6 ) / 70 = > x = 140 140 â € “ 65 = 65 answer : d
Answer: D