The area of a triangle is 25cm**2, its height is 5cm and its base is known in cm.
一个三角形的面积是25cm**2，已知它的高是5cm，底是多少cm．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<result>10</result>