One side of a rectangle is 20 cm larger than the other side. If you make the smaller side two times larger and the larger side three times larger, then the perimeter of the new rectangle would be 240 cm. Find the lengths of the sides of the original rectangle.

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  1. original rectangle:
    smaller side --- x
    larger side ---- x+20

    new rectangle:
    "smaller side" ------> 2x
    "larger side" ---- 3(x+20)

    2(2x) + 2(3(x+20)) = 240
    4x + 6(x+20) = 240

    finish it up.

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