Dongzi participated in the target shooting game in the playground. He hit 8 rings for the first time, 9 rings for the second time, and 15 rings for the third and fourth times. How many rings did he hit each time on average?
冬子参加游乐场的打靶游戏，第一次打中8环，第二次打中9环，第三与第四次共打中15环，他平均每次打中几环？
<gadget id="calculator">8 + 9 + 15</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<result>8</result>