If you use a pan to cook pancakes, you can only cook two cakes at a time, and it takes 2 minutes to cook one cake (1 minute for the front and back), so how many minutes will it take to cook 5 cakes at least?
用平底锅煎饼，每次只能煎两张饼，煎一张饼需要2分钟(正、反面个1分钟)，那么煎5张饼至少需要多少分钟．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<result>10</result>