19. The cereal box is 12 inches tall. It is 3 inches wide. The volume is 216 cubic inches. How long is the cereal box?

The volume of a rectangular box is calculated using the formula:   Volume = length × width × height. Given that the height is 12 inches and the width is 3 inches, and knowing the volume is 216 cubic inches, we can set up the equation as follows:   length × 3 × 12 = 216. Simplify 3 × 12 to get 36:   36 × length = 216. Now, solve for the length by dividing both sides of the equation by 36:   length = 216 ÷ 36,   length = 6. Therefore, the cereal box is 6 inches long.