# Greta uses 3 ounces of pasta to make 3/4 of a serving of pasta. How many ounces of pasta are there per serving?

May 3, 2018

4 ounces, and here's why:

#### Explanation:

We're given a ratio of ounces to servings; 3 ounces of pasta is 3/4 of a serving. If we write this out as an algebra equation:

$\frac{3}{4} S = 3$

Where $S$ is the serving size. Solving for $S$, we'll multiply both sides by the reciprocal of $S$'s coefficient:

$\cancel{\frac{3}{4}} S \times \textcolor{red}{\cancel{\frac{4}{3}}} = \cancel{3} \times \textcolor{red}{\frac{4}{\cancel{3}}}$

$\textcolor{g r e e n}{S = 4 \Leftarrow a n s}$