Before your trip to the mountains, your gas tank was full. When you returned home, the gas gauge registered of a tank. If your gas tank holds 18 gallons, how many gallons did you use to drive to the mountains and back
home?

Asoftball team played ten games, scoring 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 runs. they lost by one run in exactly five games. in each of their other games, they scored twice as many runs as their opponent. how many total runs did their opponents score?