Awheel has a diameter of x inches and a second wheel has a diameter of y inches. the first wheel covers a distance of d feet in 100 revolutions. how many revolutions does the second wheel make in covering d feet?

You'd want an expression which relates to x, y and d.
The distance d is x times pi times 100. One divides back by pi and by y to get the # of revolutions (that 100 :)) ) and so one gets as the number of revolutions.

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