You can only fry up to 2 fish on a pan, and it takes 6 minutes to fry a fish (3 minutes for the front and 3 minutes for the back), so how many minutes does it take at least 5 fish?
一只平底锅上最多只能煎2条鱼，用它煎一条鱼需耍6分钟(正、反面各3分钟)，那么煎5条鱼至少需要几分钟？
<gadget id="calculator">6 + 9</gadget>
<output>15</output>

<result>15</result>