A wheel 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?
A. 100xy
B. 100y – x
C. 100x – y
D. 100y / x
E. 100x/y
A wheel with a diameter of x inches covers a distance of d feet in 100 revolutions. This can be expressed in the following equation: d=100x. The second wheel, with a diameter of y inches, covers the same distance, i.e. 100x. So 100x = ?y. Using simple algebra, ? = 100x/y. The answer is (E).
Source: majortests.com
