The length of the rectangle is 78 cm, and the width is 3 times less than the length. Find the area and perimeter of this rectangle.

To solve this problem, we introduce a conditional variable “X”, through which we denote the width of the rectangle.
Then, based on the data of the problem, we will compose the following equation: X x 3 = 78.
Solving this equation, we get X = 78/3 = 26 centimeters.
Therefore, the area of the rectangle is 26 x 78 = 2028 cm ^ 2, and the perimeter of the rectangle is (26 + 78) x 2 = 208 cm.
Answer: the area of the rectangle is 2028 cm ^ 2, and the perimeter of the rectangle is 208 cm.