There were 30 chaperones going on the sixth-grade field trip. If the ratio of chaperones to students is 1 to 4, then how many people were going on the field trip?

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