A small triangular flag has a base of 0.6 meters and a height of 0.4 meters. To make 25 such small flags, how many square meters do you need to clothe at least?
一面三角形的小旗，底是0.6米，高是0.4米，做25面这样的小旗，最少需要布多少平方米？
<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">0.6 * 0.2 * 25</gadget>
<output>3</output>

<result>3</result>