The area of a triangle is 20 square meters, the base is 10 meters, and the height is in meters.
一个三角形的面积是20平方米，底是10米，高是多少米．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 * (1/5)</gadget>
<output>4</output>

<result>4</result>