To bake $12$ cookies, I use $2$ quarts of milk. There are $2$ pints in a quart. How many pints of milk do I need to bake $3$ cookies?
To bake $12$ cookies, I use $2$ quarts of milk, which is equivalent to $4$ pints of milk, since there are $2$ pints in a quart. That means I use $4$ pints of milk for every $12$ cookies, or $\frac{4}{12} = \frac{1}{3}$ pint of milk for every cookie. So to bake $3$ cookies, I need $3 \times \frac{1}{3} = 1$ pint of milk. 