One pan can fry two pancakes at a time. It takes 4 minutes to fry one side and both sides. How many minutes is the minimum time to fry five pancakes?
一个锅一次可以煎两张饼，煎一面要4分钟，两面都要煎，煎5张饼最少要多少分钟
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<result>20</result>