45 men working 8 hours per day dig 30 m deep. How many extra men should be put to dig to a depth of 50 m working 6 hours per day?  Choose one:
A) 74 B) 55 C) 44 D) 75 E) 72
55   55   (45 * 8)/30 = (x * 6)/50 =&gt; x =100   100 – 45 = 55
<result>B</result>
45 men working 8 hours per day dig 30 m deep. How many extra men should be put to dig to a depth of 50 m working 6 hours per day?