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A pulley revolving at 200 revolutions per minute has a diameter of 15 inches. It is belted to a second pulley which revolves at 150 revolutions per minute. Find the diameter, in inches, of the second pulley.

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total number of inches/min of belt must match, so

200*pi*15 = 150*pi*d
d = 200/150 * 15 = 20

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