$A$ pounds of apples cost $c$ dollars. At this rate, how many dollars will $y$ pounds of grapes cost?

Summary Submit

Set up a proportion the same way you would treat it if there were numbers instead of variables:

$$\frac{A \text{ pounds}}{c \text{ dollars}} = \frac{y\text{ pounds}}{? \text{ dollars} }$$ $$A \cdot ? = yc$$ $$? = \boxed{\frac{yc}{A}}$$