An above ground swimming pool is leaking. after 1/2 hour the pool has leaked 7/8 of a gallon of water. how many more gallons of water per hour is the swimming pool leaking?

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