45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 35 meters deep by working for 6 hours?  Choose one:	A) 10	B) 20	C) 30	D) 40	E) 50
45 workers * 8 hours / 30 meters = x * 6 / 35   x = 70 total workers   70 - 45 = 30 new workers   The answer is 30.
<result>C</result>
45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 35 meters deep by working for 6 hours?