Xiaoming's pot can only bake 3 cakes at a time, and both sides need to be baked, and each side takes 2 minutes. If you want to bake 9 cakes, how many minutes will it take at least.
小明家的锅每次只能烙3张饼，两面都要烙，每面用2分钟，如果要烙9张饼，最少要用多少分钟．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<result>12</result>