Question 1186828
According to a salad recipe, each serving requires 3 teaspoons of vegetable oil and 12 teaspoons of vinegar. If 17 teaspoons of vegetable oil were used, how
many teaspoons of vinegar should be used? How do I solve this? 
<pre>
17 teaspoons of vegetable oil compares to 3 teaspoons of vegetable oil as

x  teaspoons of vinegar compares to 12 teaspoons of vinegar. 


17 is to 3 as x is to 12

"Is to" means "over" and "as" means equal

{{{17/3}}}{{{""=""}}}{{{x/12}}}

Cross multiply

{{{17*12}}}{{{""=""}}}{{{3*x}}}

{{{204}}}{{{""=""}}}{{{3x}}}

Divide both sides by 3

{{{204/3}}}{{{""=""}}}{{{3x/3}}}

{{{68}}}{{{""=""}}}{{{x}}}

So the answer is that you would use 68 teaspoons.

Edwin</pre>