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10 March, 18:28

An artificial lake is in the shape of a rectangle and has an area of 9/10 square mile. The width of the lake is 1/5 the length of the lake. What are the dimensions of the lake?

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  1. 10 March, 21:35
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    Area of a rectangle:

    A = lw

    9/10 = 1/5l

    Divide 1/5 to both sides:

    l = 9/10 / 1/5

    Flip the 2nd fraction and multiply:

    l = 9/10 * 5/1 = 45/10 = 4.5

    So:

    Length = 4.5 or 4 1/2

    Width = 0.2 or 1/5

    Area = 0.9 or 9/10
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