You want to get the temperature of your pool up to 80 degrees. There are 30 thousand gallons of water in your pool, but it can hold more water. At this point the temperature of the pool water is 78 degrees. You will be adding water that is at a temperature of 90 degrees. How many gallons of 90 degree water do you need to add to bring the pool temperature up to 80 degrees? Give your answer to the nearest gallon.