The height of a triangle is 5 decimeters, the base is 2.4 times the height, what is its area dm**2.
一个三角形的高是5分米，底是高的2.4倍，它的面积是多少dm**2．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">2.4 * 5 * (5/2)</gadget>
<output>30</output>

<result>30</result>