Answer:
$1.89
Explanation:
This is a simple unit-rate proportion. We're trying to find the rate of 1 gallon to unknown money. To get 1 gallon, we have to divide it by 13, because that's the total gallons we start with.
13 = 24.57
/13
_________
1=24.57
Whatever we do to one side of the equation, we have to do to the other, so we divide 24.57 by 13, too.
1 = 24.57
/13
_________
1=1.89
For every gallon of gas, you pay 1.89 dollars.
Hope this helps!