1.) You can fill you car's gas tank when it is about 1/2 empty.The next week, you fill the tank a second time when it is about 3/4 empty. If you buy a total of 18 1/2 gal of gas on these two days, abouthow many gallons does the tank hold?
capacity of tank = x gal
x/2 + 3/4 x = 18.5
times 4
2x + 3x = 74
5x = 74
x = 14.8