There is a big tree on the playground of the experimental school, and a 2.5-meter bamboo pole stands beside it. At 10:00 am, the students also measured that the shadow of the bamboo pole is 2 meters long and the shadow of the big tree is 6.4 meters long. Find the height of the tree. (Solve with ratio)
实验学校操场上有一棵大树，旁边立有一根2.5米的竹杆，上午十时同学们同时测得竹杆影长2米，大树影长6.4米．求大树的高度．(用比例解)
<gadget id="calculator">2.5 * 6.4</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>