Only 2 cakes can be baked at most at a time, and both sides must be baked, and each side takes 4 minutes. How many minutes does it take to bake 6 cakes?
每次最多只能烙2张饼，两面都要烙，每面需要4分钟．烙6张饼至少需要多少分钟．
<gadget id="calculator">3 * 4 * 2</gadget>
<output>24</output>

<result>24</result>