How do you solve?
(C) it is
A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the larger rim make in terms of x?
a) 48pi/x b) 75x c) 48x d) 24x e) x/75
28 * pi * x = 35 * pi * y
=> y = (28 * pi)x/(35 * pi) (revolutions/sec)
=> y = (60 * 28 * pi * x)/(35 * pi) = 48x (revolutions/min)