you are baking 20 giant sugar cookies with a diameter of 3 inches what will be the area that the icing will cover if you ice all 20 cookies

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2x minus y equals 6, x plus y equals negative 3

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?