A rectangle is 3 times as long as it is wide and its perimeter is 120 centimeters. find area.

The perimeter is the sum of the sides since opposite sides are = in rectangle add 2w+2l let x=width 3x = length 8x = 120 x=15 substitute 15 for x w=15 l = 45 area = l x w 15 x 45 = 675 area = 675 cm.