If gas is $2.45 and you pay $ 12.00 how many gallons of gas do you get ?

Gas is 2.45 per gallon.  So if we pay $12 we get 12÷2.45 gallons:

12 ÷ 2.45 ≈ 4.90 gallons.

You get roughly 4.90 gallons.

You will divide 12/2.45
The answer is 4.89795918