The area of a triangular vegetable field is 80 square meters and the height is 40 meters. How many meters is the bottom of this vegetable field?
一块三角形菜地的面积是80平方米，高是40米，这块菜地的底是多少米？
<gadget id="calculator">80 / 40</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>