One pan can fry two cakes at a time. It takes 2 minutes to fry one side. How many minutes does it take to fry five cakes at least?
一只锅一次可煎两块饼，煎一面需2分钟，煎5块饼至少要用多少分钟
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

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

<result>10</result>