To solve this, you can set up an equation to model this situation: [tex]40x+60y=520[/tex]. In this equation, x is the number of cars rented that day and y is the number of vans. The number of cars rented is known (7) so you can plug 7 into the equation and then solve for y.
[tex]40(7)+60y=520[/tex]
[tex]280+60y=520[/tex]
[tex]60y=240[/tex]
[tex]y=4[/tex]
The answer is 4 vans.
