The tallest of 3 trees is 108 feet.  The middle sized tree is 6 feet less than half the height of the tallest tree. The smallest tree is 1/4 the height of the middle tree.  How tall is the smallest tree?
Tallest Tree: 
<gadget id="calculator">108</gadget>
<output>108</output>
108 feet.
Middle sized tree:(108/2)-6=
<gadget id="calculator">108/2-6</gadget>
<output>48</output>
48 feet.
Smallest tree:48/4=
<gadget id="calculator">48/4</gadget>
<output>12</output>
12 feet.

<result>12</result>