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Pat has two sheets of large, square stamps. One sheet consists of 9  stamps arranged in a 3-by-3 square. (That's 3 stamps by  3stamps, not 3 inches by 3 inches.) The other sheet consists of  36 stamps arranged in a 6 by 6 square. The stamps on each sheet are separated by perforated creases. All the stamps on both sheets are the same shape and size.

The total length of the creases on the 3 by-3 sheet is 18 inches.

How many inches of creases does the 6-by-6 sheet have?

 Jan 20, 2019
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i gave you a hint in the same question here: https://web2.0calc.com/questions/help_57731

 Jan 20, 2019

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