There is a triangular paddy field of 0.4 hectares, the bottom is 160 meters, what is the height in meters.
有一块0.4公顷的三角形稻田，底是160米，高是多少米．
<gadget id="calculator">0.4 * 10_000</gadget>
<output>4_000</output>

<gadget id="calculator">2 / 160</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">4_000 * (1/80)</gadget>
<output>50</output>

<result>50</result>