Question

Sari wrote the equivalent ratios below to convert cups to fluid ounces.

StartFraction 8 fluid ounces Over 1 cup EndFraction = StartFraction question mark fluid ounces Over 9 cups EndFraction

How many fluid ounces are in 9 cups?
64 fluid ounces
72 fluid ounces
80 fluid ounces
81 fluid ounces

Answer 1

To find out how many fluid ounces are in 9 cups, we can use the equivalent ratio given:

\[
\frac{8 \text{ fluid ounces}}{1 \text{ cup}} = \frac{x \text{ fluid ounces}}{9 \text{ cups}}
\]

To find \(x\), we can set up the proportion:

\[
8 \text{ fluid ounces} \times 9 \text{ cups} = x \text{ fluid ounces} \times 1 \text{ cup}
\]

This simplifies to:

\[
8 \times 9 = x
\]

Calculating this gives:

\[
x = 72 \text{ fluid ounces}
\]

Thus, there are **72 fluid ounces** in 9 cups. Therefore, the correct answer is **72 fluid ounces**.