Final answer:
To find the number of cans Bonnie knocked down, you can use the equation 6n = 78.
Step-by-step explanation:
To find the number of cans Bonnie knocked down, we can create an equation using the given information. Let n represent the number of cans Bonnie knocked down. Since each knocked-down can earns 6 points, we can write the equation as 6n = 78. By dividing both sides of the equation by 6, we can find the value of n, which is the number of cans Bonnie knocked down.
Therefore, the equation that can be used to find n is 6n = 78.