Question

Rodney is making three pizzas. The recipe says that, for one pizza, he needs 2 cups of flour, 2 teaspoons of instant active dry yeast, 2 cloves of garlic, 1 tablespoon of olive oil, and some other ingredients. Rodney is out of flour, and goes to the store to buy a bag containing 20 cups of flour. How much flour will he have left over after making the pizzas?*

Answer 1

How much flour does one pizza take?

Answer 2

Then three pizzas take three times as much.
Subtract that total from the amount bought.