A pan can fry up to 3 pancakes at a time. Pancakes need to be pan-fried on both sides. It takes 4 minutes to fry one side. How many minutes does it take at least to pan-fry 6 pancakes?
一个锅一次最多可以煎3个饼，饼要两面都要煎，煎一面要4分钟，煎6个饼至少需要多少分钟．
<gadget id="calculator">4 * 2 * 2</gadget>
<output>16</output>

<result>16</result>