The sum of the length and width of a rectangle is 18 cm. What is its area if the length

The sum of the length and width of a rectangle is 18 cm. What is its area if the length of the rectangle is 4 cm longer than its width?

The solution of the problem:
1. The width of the rectangle is x centimeters.
2. The length of the rectangle is (x + 4) centimeters.
3. Let’s compose and solve the equation.
x + (x + 4) = 18;
x + x + 4 = 18;
x + x = 18 – 4;
2x = 14;
x = 14/2;
x = 7;
4. The width of the rectangle is x = 7 centimeters.
5. The length of the rectangle is x + 4 = 7 + 4 = 11 centimeters.
Let’s answer the question of the problem.
6. Determine what is the area of the rectangle.
7 * 11 = 77 cm2.
Answer: The area of a rectangle is seventy-seven square centimeters.