My cupcake recipe makes 12 cupcakes and requires 3 1/2 sticks of butter. I can only buy whole sticks of butter. How many whole sticks of butter must I buy to make 100 cupcakes?
100 / 12 = (N) / 3.5
3.5 * 100 / 12 = (N)
29.16 = N
You need 30 sticks