Use a pan to pancake, only two can be placed at a time, and it takes 6 minutes to fry one pancake. It is stipulated that the front and back sides of each pancake need 3 minutes. Ask how many minutes it takes to cook 3 pancakes.
用一只平底锅煎饼，每次只能放两个，煎一个需要6分钟，规定每个饼的正反面各需3分钟．问煎3个饼至少需要多少分钟．
<gadget id="calculator">3 + 3 + 3</gadget>
<output>9</output>

<result>9</result>