Question

There are 33.8 fluid ounces in a liter. There are 128 fluid ounces in a gallon. How many liters are in a gallon?

Answer 1

There are 3.79 liters in a gallon

Solution:

Given that, There are 33.8 fluid ounces in a liter

Which means,

1 liter = 33.8 ounces

Also, given that, There are 128 fluid ounces in a gallon

Which means,

1 gallon = 128 ounces

To find: how many liters are in a gallon

Which means,

1 gallon = ? liters

We can use the rule of three to solve the sum

To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

Then

$x = \frac{c \times b}{a}$

There are 128 fluid ounces in a gallon, you can determine how many liters are in a gallon by applying a rule of three as follows:

If there are 33.8 fluid ounces in a liter, how many liters are in 128 fluid ounces (a gallon)?

33.8 ounce = 1 liter

128 ounce = x liter

$x = \frac{1 \times 128}{33.8}\\\\x = 3.78$

Then, in a gallon there are  approximately 3.79 liters