QUESTION

# Convert 1 gallon into liters.a. 3.05 litersb. 3.78 litersc. 4.05 litersd. 4.78 liters

Hint: Find the expression of Gallon in the US and imperial gal. Find the amount of U.S gallon that signifies a liter.

Gallon is an imperial and United States customary measurement systems volume unit. Gallons are used in the fuel economy expressions. The gallon was removed from the list of legally defined primary units of measure catalogued for trading and official purpose.

Gallon is represented by the symbol ‘gal’.

Accordingly,
1 US fluid gal = 3.785411784 liters.
1 US dry gal = 4.4048838 liters.
1 imperial gal = 4.54609 liters.

Thus a US gallon is a unit of volume equal to 128 U.S fluid ounces or about 3.785 liters. A liter or liter is a unit of volume in the metric system. There are about 3.785 liters in a U.S gallon.
$\therefore$ 1 gallon = 3.78 liters

Hence option (b) is the correct answer.

Note: If a standard barrel holds 60 gallons of liquid. Then let us find how many liters of liquid the barrel can hold. 1 gallon = 3.785 liters.
Thus 60 gallons = 60 $\times$ 1 gallon
$=60\times 3.785$ liters = 227.1 liters.