A tree with a height of 4 meters on the avenue has a shadow of 6 meters. If the shadow of the tree next to it is 4.5 meters long, what is the height of the tree?
在林荫道上一棵树高4米，它的影子为6米．若它旁边的树影长4.5米，这棵树高多少米．
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 4.5</gadget>
<output>3</output>

<result>3</result>