Which of the following is a chemical property ? A . Length of a matchstick B . Color of a match stick C . Ability of a matchstick to float on water D . Ability of a matchstick to burn when struck

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