There is six buses parked in a lot. each bus needs 3 1/3 quarts of oil. how much oil is needed by all of the buses express you answer in simplest form. plz me plz

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad