<p>is it just me or the part where it says "twice as many $1 bulbs as $2 bulbs"
can be interpreted as y = 2x instead of x = 2y
where x = $1 bulbs
y= 2$ bulbs</p>
<p>no........its correct as written</p>
<p>The easiest way to do it would be to plug in numbers. If you have 20 $1 bulbs and 10 $2 bulbs only the x=2y fits.</p>