The measurement team wanted to measure the height of a tree. First, the shadow of the tree was measured to be 12 meters long. Then a bamboo pole with a length of 2 meters was erected near the tree, and the shadow of the bamboo pole was measured to be 1.2 meters long. How tall is the tree in meters?
测量小组要测量一棵树的高度，先量得树的影子长12米，接着在树的附近直立了一根长2米的竹竿，量得竹竿的影子长1.2米．这棵树的高度是多少米？
<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">12 / 0.6</gadget>
<output>20</output>

<result>20</result>