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19 December, 22:54

The length of a rectangle is five centimeters more than twice its width. The perimeter is 100 centimeters. Use Guess and Check to find out how long and how wide the rectangle is.

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  1. 19 December, 23:16
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    Guessing and checking isn't the best solution, so I will demonstrate it another way.

    Let x be the width. We know that the length is then 2x+5.

    So, 2 (x+2x+5) = 100

    3x+5=50

    3x=45

    So, x=15.

    Therefore, the rectangle is 15 centimeters wide.

    Guessing and checking could also work. Once you plug in a value, if it is less than 100, than increase you number. The other way works as well.
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