Every 8 tennis balls are packed into a cylinder, and a total of 168 tennis balls are prepared. How many cylinders can be loaded? (Solutions to the equations.)
网球每8个装一筒，一共准备了168个网球，能装多少筒？(列方程解答．)
<gadget id="calculator">168 / 8</gadget>
<output>21</output>

<result>21</result>