What was the problem look like if you change the fraction 311/500 to a decimal

What is the result of the following division?

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

How do i i solve this equation? -18 = x/3 + 3