The primeter of a rectangle is 30 inches. If its lengthis three times its length, find the dimensions

Perimeter = 30 inches

Length = 3x

Width = X

P = 2L + 2W

30 = 2 (3x) + 2 (X)

30 = 6x + 2x

30 = 8x

30/8 = 8x/8

3 6/8 = 3 3/4 = X

X = 3.75 inches

The width is 3.75 inches and red length would be 3 times as much or 3 (3.75) = 11.25 inches.