Oh, dude, I'm not a math whiz, but like, if you add 4.5 liters and 7.5 liters, you get 12 liters. And if you throw in another 15 liters, you end up with a grand total of 27 liters. So, yeah, that's your answer.
There are 3.78541 liters in a gallon. Therefore, half a liter is equivalent to 0.5 liters. To find out how many half liters are in a gallon, you would divide 3.78541 by 0.5, which equals 7.57 half liters in a gallon. However, since you cannot have a fraction of a half liter, the practical answer is 7 half liters in a gallon.
7 and three quarter (7+3/4th)
1.75
7 and a half
It is: 112/15 or 7 and 7/15
1/15
It is: 2.5+4.5 = 7
3 and 15 sixteenths
15
7 + 7 + 7/7 = 15
4 pints, 2 2/7 litres
7 1/2