New hints for age_word_problems

Here are some new hints for the age word problems. These hints convert the given information into a set of equations, then solve the equations.

I was going to add some subhints to point out other potential solution routes, but I couldn't get them to work. I used the following code to change colors in the problem statement:

<code>&lt;div class="graphie"&gt;
$(".first").addClass("hint_blue");
&lt;/div&gt;</code>

If this code is executed in a previous hint, the subhint link ends up being unclickable. Deleting the jQuery doesn't fix it, but deleting the entire "graphie" class division results in a functioning subhint.