Use a pan to make pancakes, assuming that it takes 4 minutes to fry a pancake (2 minutes for each side), and a pancake pan can cook exactly 2 pancakes at a time. How many minutes does it take to fry 5 pancakes?
用一只平底锅煎饼，假设煎一张饼需要4分钟(每一面需要2分钟)，一个煎饼锅每次正好可以煎2张．煎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>