Ted brought a cooler containg 7.5 liters of water to a picnic. if 500 milliters of water milliliters of water are served to each person ,how many people can get water before the cooler is empty?

While on a train trip, marsha noticed that there were 35 people in her train car. after the next stop, there were only 21 people in her car. if p represents the percent decrease in the number of people in marsha's train car, what is p?