posted by carolina .
math question: you want to mat and frame a 5x 7 photograph. The perimeter of the outside of the mat is 60 inches. the mat is twice as wide at the top and the bottom as it is on the sides. Find the dimensions of the mat
mat: 5+2*2w x 7+2*w
2(5+4w + 7+2w) = 60
w = 3
so, if the mat is 3" wide on the sides, and 6" wide top and bottom, it is 17x13 if it's a landscape. Or, it might be 19x11, if it's a portrait.