Pancakes in a pan can bake two cakes at a time, and both sides must be baked. It takes 8 minutes to bake one cake, how many minutes is the fastest time to bake 7 cakes?
平底锅烙饼，每次能烙两张饼，两面都要烙．烙熟一张饼需要8分钟，烙7张饼最快需要多少分钟．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">16 + 12</gadget>
<output>28</output>

<result>28</result>