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31 July, 18:05

If the side of a square is doubled and then increased by 7, the new perimeter is 8 more then 3 times the old perimeter. What is the side of the original square?

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  1. 31 July, 18:10
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    Let the side of the original square be x. The perimeter is 4x.

    The new side of the square is 2x+7 and the new perimeter is 4 (2x+7) = 8x+28.

    So 8x+28=12x+8. 4x=20, so x=5, the side of the original square.
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