A triangular paddy field with a bottom of 100 meters yields a total of 6.45 tons of paddy. If 21.5 tons of rice are harvested per hectare, what should be the height of the field?
一块三角形的稻田，底是100米，共收稻谷6.45吨．如果每公顷收稻谷21.5吨，这块地高应是多少？
<gadget id="calculator">6.45 / 21.5</gadget>
<output>0.3</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">0.3 * 10_000 * (1/50)</gadget>
<output>60</output>

<result>60</result>