In the labor class, the students learn to fry fish. Both sides of the fish must be fried. You can put up to four fish in the pot at a time. It takes 5 minutes to fry each side. How many minutes does it take to fry 6 fish at least?
劳动课上，同学们学煎鱼，鱼的两面都要煎，锅里一次最多可以放四条鱼，每煎一面要5分钟，煎6条鱼至少要多少分钟？
<gadget id="calculator">5 + 5 + 5</gadget>
<output>15</output>

<result>15</result>