If one gallon equals 3.78 liters how many liters are in 3 gallons?

1 Gallon = 3.78 liters

3 Gallons = ?

You need to notice that the gallon changed by a rule of x3 (times three). So multiply the liters by 3 to get your answer

3.78 x 3 = 11.34

11.34 liters is your answer