Here’s how you would set up this question as an equation:
The goal of the problem is to solve for x. To do this we need to change the equation so that x is alone on one side of the equation.In this case, we can do that by multiplying both sides of the equation by 4, resulting in this equation:
Then we simplify and find our answer:
So, the answer to the question “What divided by 4 equals 20?” is 80.To prove this, we can take the original problem:
And insert 80 in the place of x:
Because this is true, the answer must be correct.