Question

John drank 18 fluid ounces of juice. How much is this in cups? Write your answer as a whole number or a mixed number in simplest form. Include the correct unit in your answer.

Answer 1

We know that 1 cup is equivalent to 8 fluid ounces. Then, we can establish the following rule of three:

`\begin{gathered} 8\text{ fluid ounces ----- 1 cup} \\ 18\text{ fluid ounces ------ x} \end{gathered}`

Then, by cross multiplying these quantities, we have

`x*8\text{ fluid ounces= 1 cup}*\text{ 18 ounces}`

By dividing both sides by 8 fluid ounces, we get

`x=\frac{1\text{ cup}*18\text{ ounces}}{8\text{ fluid ounces}}`

which gives

`x=(18)/(8)\text{ cups}`

Now, we need to convert this simple form to a mixed form, that is,

Then, by simplifying this mixed form, the answer is:

`2(1)/(4)\text{ cups}`