It takes 4 minutes to bake a cake (2 minutes for the front and 2 minutes for the reverse side), a pan can bake 2 cakes at a time, and how many minutes does it take to bake 5 cakes at least.
烙一张饼需要4分钟(正、反面各2分钟)，一个平底锅每次可以烙2张饼，烙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>