The area of a triangle is 13 square meters, the height is 5 meters, and the base is in meters.
一个三角形的面积是13平方米，高是5米，底是多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">13 * (2/5)</gadget>
<output>26/5 = around 5.2</output>

<result>26/5 = around 5.2</result>