There are 6 table tennis balls in a box, and each table tennis ball is 3 yuan. Mr. Zhang paid 216 yuan for the table tennis balls. How many boxes of table tennis balls did you buy? (After answering, use another method to check)
一盒乒乓球有6个，每个乒乓球3元，张老师买乒乓球付了216元，买了多少盒乒乓球？(解答后用另一种方法检验)
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">216 / 18</gadget>
<output>12</output>

<result>12</result>