A triangular flower bed, the base is 15 meters, which is 3 times the height. How many square meters does this flower bed occupy?
一个三角形的花坛，底边是15米，是高的3倍．这个花坛的占地面积是多少平方米？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">15 * (5/2)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>