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19 May, 08:57

A rectangular garden is 20 ft longer than it is wide. its area is 800 ft^2. what are its dimensions?

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  1. 19 May, 10:55
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    You need to set a variable to represent the width, let's say "w'.

    width = w

    length (l) = 20 + w

    Area = length * width

    A = (20 + w) * w

    See how I substituted the length in terms of w, above? We also know the area, so plug that in:

    A = (20 + w) * w

    1500 = (20 + w) * w

    Solve for w. If it's easier, rewrite as:

    1500 = w (20 + w)

    Distribute the right side, and solve for w (width).

    Then plug back into the equation for length - -> length = 20 + w to find the other dimension
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