GRE Exam Numerical Ability Area and Volume

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

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GRE Other Question
A picture is copied onto a sheet of paper 8.5 inches by 10 inches. A 1.5 inch margin is left all around. What area in square inches does the picture cover? For how many integer values of n will the value of the expression 3n + 5 be an integer greater than 1 and less than 200?