Question

Rob uses $2$ cups of milk to make $10$ muffins. How many cups of milk will Rob need to make $15$ muffins?

• A. $4$
• B. $3$
• C. $6$
• D. $5$

Answer 1

The correct option is B $3$

Let’s assume Rob needs x cups of milk to make $15$ muffins.
There is a proportional relationship between the number of cups of milk Rob uses and the number of muffins he makes.
According to the proportional relationship,

$\frac{2}{10}=\frac{x}{15}$
$\Rightarrow \frac{2}{10}\times 15=\frac{x}{15}\times 15$ (We multiply both sides of the proportion by 15.)
$\Rightarrow x=3$
Hence, Rob will need 3 cups of milk to make $15$ muffins.