Given a rectangle with sides 18 cm long and 3 times less wide. Find the perimeter and area.

If the length of the rectangle is 18 cm, and the width is 3 times less, then we find its width:
18/3 = 6.
The perimeter of a rectangle is equal to the sum of the milestones of its sides, taking into account that the opposite sides are equal:
18 * 2 + 6 * 2 = 36 + 12 = 48.
The area of a rectangle is equal to the product of its length and width:
18 * 6 = 108.
Answer: the perimeter of the rectangle is 48 cm; the area of the rectangle is 108 cm2.