Last week Fred had w dollars and Jason had x dollars. Over the weekend Fred delivered newspapers earning y dollars and washed cars earning z dollars. How much money did Fred earn over the weekend?
First, we need to find out how much money Fred had at the beginning of the weekend. We know that he had w dollars, and we know that Jason had x dollars. We also know that, at the end of the weekend, Fred had more money than Jason. So, we can set up the following equation:

w + y + z > x

Now, we need to solve for y + z. We can do this by subtracting w and x from both sides of the equation:

y + z > x - w

Now we know that, over the weekend, Fred earned more than x - w dollars.