(here are the options) a. 25/91, b.66/200, c. 91/200, 66/91. i promise its only one question

What is the size of the matrix resulting from

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

If you could answer these your a life saver