We can see that the car gas tank was filled to 10 1/2 gallon
Since $15.25 was paid, we need to know the cost of the gas per gallon
Mathematically, we can express 10 1/2 as 10.5
So the cost per gallon will be;
amount paid/capacity of gas tank filled
That would be; 15.25/10.5 = 1.452381
This is approximately $1.45 per gallon of gas