# A recipe requires 3 cups of flour to bake 12 muffins. How many cups of flour are needed to bake 15 muffins?

Simplify the ratio of $15 : 12$ by dividing $15$ by $12$ , and you get $1.25$ . That means $1.25 \cdot 12 = 15$. If you then take $1.25 \cdot 3$ you get $3.75$