Tanks A and B are each in the shape of a right circular cylinder. The interior of tank A has a height of 10 meters and a circumference of 7 meters, and the interior of tank B has a height of 7 meters and a circumference of 10 meters. The capacity of tank A is what percent of the capacity of tank B? Choose the correct choice:
A) 70% B) 80% C) 100% D) 120% E) 125%
The radius of tank A is 7/(2*pi).   The capacity of tank A is 10*pi*49 / (4*pi^2) = 245 / (2*pi)   The radius of tank B is 10 / (2*pi).   The capacity of tank B is 7*pi*100 / (4*pi^2) = 350 / (2*pi)   Tank 70% / Tank B = 245/350 = 7/10 = 70%   The answer is 70%.
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Tanks A and B are each in the shape of a right circular cylinder. The interior of tank A has a height of 10 meters and a circumference of 7 meters, and the interior of tank B has a height of 7 meters and a circumference of 10 meters. The capacity of tank A is what percent of the capacity of tank B?