The sum of the length and width of the rectangle is 21 cm. find the length and width

The sum of the length and width of the rectangle is 21 cm. find the length and width of a rectangle if its length is 6 times its width

Let the width of the rectangle be x cm, then its length will be 6x cm. Knowing the sum of the length and width of the rectangle, we can draw up an equation and solve it:

x + 6x = 21;

7x = 21;

x = 21/7;

x = 3.

If x = 3, then the rectangle is 3 cm wide and 18 cm long.

Answer: 3 cm, 18 cm.

Examination:

3 + 18 = 21;

21 = 21.