Perimeter of a Rectangle

The perimeter of a rectangle is 310 m. The length is 25 m greater than the width.
What are the length and width of the rectangle?

x = width
x + 25 = length
2x + 2(x + 25) = 310  {2 times width plus 2 times length = perimeter}
2x + 2x + 50 = 310  {used distributive property}
4x + 50 = 310  {combined like terms}
4x = 260  {subtracted 50 from both sides}
x = 65 m width  {divided both sides by 4}
x + 25 = 90 m length  {substituted 65 in for x}

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