Question 1123818
<pre>
oldest        2y
middle         x
youngest       y
total         64
</pre>

{{{system(2y-x=6,2y+x+y=64)}}}


{{{x=2y-6}}}
-
{{{3y+x=64}}}
{{{3y+(2y-6)=64}}}
{{{5y-6=64}}}
{{{5y=70}}}
{{{y=70/5}}}

{{{highlight(y=14)}}}