Lia has already baked 2 cakes, and she can bake 1 cake with each additional stick of butter she buys. How many additional sticks of butter does Lia need in order to bake a total of 47 cakes?
She needs 45 more sticks of butter. This is because she already has two cakes, and 47-2=45. She can bake one more cake with each stick of butter, which means the answer is indeed 45.
