It is known that the perimeter of a rectangle is 18 cm and its width is 3 cm. What is the exact length of the rectangle?

The solution of the problem:
The perimeter of the rectangle is the sum of all sides. From the condition of the problem, the perimeter and width of the rectangle are known. To answer the question of the problem, you need to know the sum of the two sides of the rectangle.
1. Find out what the sum of one width of the rectangle and the second width is equal to.
3 + 3 = 6 centimeters.
2. Let’s calculate what is the sum of two dimensions of the length of the rectangle.
18-6 = 12 centimeters.
Let’s answer the question of the problem.
3. What is the length of the rectangle?
12/2 = 6 centimeters.
Answer: The length of the rectangle is six centimeters.