The area of a triangle is 30 square decimeters, the height is 5 decimeters, what is its base?
一个三角形的面积是30平方分米，高是5分米，它的底是多少分米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<result>12</result>