Question

The art teacher mixed 12 ounces of yellow paint with 5 ounces of blue paint to make green. How many ounces of blue would be needed if you used 20 ounces of yellow ?

Answer 1

The relation is 12 ounces of yellow paint with 5 ounces of blue paint. To find how many ounces of blue would be needed if you used 20 ounces of yellow, we can use the next proportion:

$\frac{12\text{ ounces of yellow}}{20\text{ ounces of yellow}}=\frac{5\text{ ounces of blue}}{x\text{ ounces of blue}}$

Solving for x,

$\begin{gathered} 12\cdot x=5\cdot20 \\ 12\cdot x=100 \\ x=\frac{100}{12} \\ x=\frac{25}{3} \end{gathered}$

You would need 25/3 ounces of blue paint