Working alone, Carlos can oil the lanes in a bowling alley in five hours. Jenny can oil
the same lanes in nine hours. If they worked
together how long would it take them?

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.)