Xiao Ming bought 4 ballpoint pens and spent 6 yuan. Xiaogang wants to buy 12 of the same ballpoint pens, how much does it cost?
小明买了4支圆珠笔用了6元．小刚想买12支同样的圆珠笔，需要多少钱？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 6</gadget>
<output>18</output>

<result>18</result>