Use a frying pan to make pancakes, only put 2 pancakes at a time, and it takes 4 minutes to fry 1 pancake (it is stipulated that the front and back sides need 2 minutes each), ask how many minutes it will take to fry 9 pancakes at least.
用一只平底锅煎饼，每次只能放2只饼，煎1只饼需要4分钟(规定正反两面各需要2分钟)，问煎9只饼至少需要多少分钟．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<result>18</result>