The rectangle is 18 cm wide, which is 45% of its length. what is the area of this rectangle?

To find the number by percentage, you need to divide the given number by the given percentage value, and multiply the result by 100. First of all, let’s calculate what the length of the rectangle is, knowing that 45% of it is 18 centimeters.

18/45 * 100 = 0.4 * 100 = 40 cm.

Let’s calculate what is equal to the area of a rectangle 40 cm long and 18 cm wide. To do this, we find their product.

S = 18 * 40 = 720 m².

Answer: 720 m².