Pat has two sheets of large, square stamps. One sheet consists of stamps arranged in a 3-by-3 square. (That's 3 stamps by 3 stamps, 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 18-by-18 sheet have?
The 3 x 3 sheet has 4 creases ...two vertical and two horizontal
each crease is 18/4 = 4.5 inches and covers 3 stamps so each stamp has a side length of 4.5/3 = 1.5 inches
The 6 x 6 sheet has 10 creases 5 vert and 5 horiz
each crease covers 6 stamps
6 x 1.5 x 10 = 90 inches in a 6x6 sheet
Then you question asks about a 18 x 18 ....is that correct?
