The area of a triangle is 10 square decimeters, the height is 5 decimeters, what is the length of the base?
一个三角形的面积是10平方分米，高是5分米，底边长多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>