In order to enrich students' after-school life, the school bought 3 boxes of yo-yos, each with 12 yo-yos, and the total cost was 648 yuan. How much is each yo-yo?
为了丰富学生的课余生活，学校买来了3盒悠悠球，每盒12个，一共花了648元，每个悠悠球多少元？
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">648 / 36</gadget>
<output>18</output>

<result>18</result>