John has a large water collection tank. The tank can hold 200 gallons. It weighs 80 pounds empty. A rainstorm fills it to 80% of capacity. If a gallon of water weighs 8 pounds, how much does it weigh now? Let's answer step by step:
The tank has 200 * .8 = 160 gallons of water in it. That water weighs 160 * 8 = 1280 pounds. So in total it weighs 1280 + 80 = 1360 pounds. The answer: 1360.