There is a rectangular piece of hard paper with an area of 90 square centimeters. The ratio of width to length is 3:5. Cut the largest square from it, and the rest is left What's the area of the square centimeter?

Let X be the width of a rectangle
X*(5X/3) = 90
The solution is x = √ 54 (root 54)
So minus the area of the next block is x * x = √ 54 * √ 54 = 54 square centimeters
So 90-54 = 36 square centimeters

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