45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 40 meters deep by working for 6 hours?
Choose the correct answer:
A) 75 B) 80 C) 50 D) 35 E) 40
45 workers * 8 hours / 30 meters = x * 6 / 40   x = 80 total workers     80 - 45= 
<gadget id="calculator">  80 - 45</gadget>
<output>35</output>
35   The answer is 35.
<result>D</result>
45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 40 meters deep by working for 6 hours?