A wheel has a diameter of x inches and a second wheel has a diameter of y inches. The second wheel covers a distance of d feet in 400 revolutions. How many revolutions does the first wheel make in covering d feet?	Choose the correct choice from the following answers
A) 400xy  B) 400y - x  C) 400x - y  D) 400y/x  E) 400x/y
second Wheel with diameter x inches ----&gt; So the circumference = x*pi --------- (1)   first Wheel with diameter y inches ----&gt; So the circumference = y*pi --------- (2)   Revolutions = distance/circumference   So, from equation (1)   400 = d/(x*pi)   d = 400 * x * pi ---------- (3)   From equation (2)   Revolutions = d/(y*pi) = (400 * x * pi) / (y*pi) = 400x/y   Answer (400x/y)
<result>E</result>
A wheel has a diameter of x inches and a second wheel has a diameter of y inches. The second wheel covers a distance of d feet in 400 revolutions. How many revolutions does the first wheel make in covering d feet?