The length of a rectangle is 3 times its width, find the area of a rectangle if its width is 12 cm less than its length.

Let the width of the rectangle be x. Then its width will be 3x. At the same time, the width of the rectangle is 12 cm less than its length, or:

x = 3x – 12.

Let’s solve the equation:

3x – x = 12;

2x = 12;

x = 6 cm width of the rectangle.

Now let’s find its width:

3x = 3 * 6 = 18cm width.

With a known length and width, you can find the area. To do this, you need to multiply the length and width:

18 * 6 = 108 cm2 area.

Answer: 108 cm2.