Question 972904
<a href="http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev">http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev</a>


You can do the problem through ONE variable and solving may be simpler.


Let x be how much of the 30% antifreeze to use.
85-x is the amount of the 50% antifreeze to use.


{{{(30x+(85-x)50)/85=38}}}