Mother’s pancakes can only be baked two at a time, both sides must be baked, each side is baked for 2 minutes, how many minutes is the minimum time to bake 5 cakes.
妈妈烙饼，每次只能烙两张，两面都要烙，每面烙2分钟，烙5张饼至少要多少分钟．
<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>