The area of a triangle is 40 square meters, its height is 4 meters, and its base is in meters.
一个三角形的面积是40平方米，它的高是4米，它的底是多少米．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<result>20</result>