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The sides of a rectangle are in a ratio. What is the length of the shorter sides of the rectangle if its perimeter is 42 cm?

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    Ratio = 2:5?
    P = 42 cm.

    X cm = Long side.
    2x/5 cm = Short side.

    2x + 2*2x/5 = 42 cm.
    10x + 4x = 210
    14x = 210
    X = 15 cm.
    2x/5 = 2*15/5 = 6 cm.

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