Question

Gayle is making fruit punch that consists of 2 quarts of juice and 1 quart of soda water. How much soda water does she need if she has 5 quarts of juice?

Answer 1

You can set it up like this:
\[\color{green}{2 : 1 = 5 : x \\ \frac{2}{1} = \frac{5}{x}}\] Cross multiply, simplify, and solve for x.