At the same time at noon on the same day, Xiaoqiang measured that the shadow length of a tree was 400 cm long, and Xiao Hong measured that the shadow length of a 3-meter-long bamboo pole was 100 cm. How tall is this tree?
在同一天中午的同一时刻，小强测得一棵树的影子长400厘米，小红测得一根长为3米的竹竿的影长是100厘米，这棵树高多少米？
<gadget id="calculator">300 / 100</gadget>
<output>3</output>

<gadget id="calculator">3 * 400</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 100</gadget>
<output>12</output>

<result>12</result>