A bag contains 7 red balls and 15 brown balls. A ball is picked from the lot at random. What is the Probability that the ball drawn is-​

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