7 squares can be made from the 35" edge because 7×5=35, but only 4 squares can be made from the 23” side because 4×5=20, and 5×5=25, which is greater than 23". So the area that can be covered is 7×4=28 pieces, that is, 28×5×5 sq in = 700 sq in, out of the available 805 sq in, without breaking up any squares. (875 sq in would be needed to make 35 squares.)