A group of friends decided to buy snacks for their movie night. They calculated that they would need 3 bags of popcorn for every 5 friends. If they invite 25 friends, how many bags of popcorn do they need to buy?
To find the total number of bags of popcorn, you can set up a proportion or use multiplication.
Let the number of bags needed be represented by the variable $x$. The relationship can be expressed as:
$$ x = rac{3}{5} imes 25 $$
Calculate $x$ to find the answer.