big boat can hold 12 people, and each small boat can hold 3 people less than the big boat. A total of 54 students want to take a small boat. How many small boats are needed?
一条大船可以坐12人，每条小船比大船少坐3人，一共有54名同学都想坐小船，需要多少条小船？
<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<gadget id="calculator">54 / 9</gadget>
<output>6</output>

<result>6</result>