The length of the rectangle is 20 cm and the width is 12 cm. Find the length of a rectangle with the same

The length of the rectangle is 20 cm and the width is 12 cm. Find the length of a rectangle with the same area if its width is 3 times less than the width of the first rectangle.

The solution of the problem:
1. Determine the width of the second rectangle:
12/3 = 4.
2. Determine the area of the first rectangle, knowing that it is equal to the product of the length of the rectangle by its width:
20 * 12 = 240.
3. Denote by variable x the length of the second rectangle.
4. Knowing that the area of the second rectangle is equal to the area of the first rectangle, we create an equation and find the length of the second rectangle:
4 * x = 240;
x = 240/4 = 60.
Answer: The length of the second rectangle is 60 cm.