What is X?  X + 2X = 1200

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?