45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 30 meters deep by working for 6 hours?	Choose the correct choice from the following:
A) 10  B) 15  C) 20  D) 25  E) 30
45 workers * 8 hours / 30 meters = x * 6 / 30   x = 60 total workers     60 - 45= 
<gadget id="calculator">  60 - 45</gadget>
<output>15</output>
15 new workers   The answer is 15.
<result>B</result>
45 workers work 8 hours to dig a hole 30 meters deep. How many extra workers should be hired to dig another hole 30 meters deep by working for 6 hours?