The students are divided into three groups to shoot. The first group has 3 people, and each person makes 10 shots on average; the second group has 4 people, and each person makes 8 shots on average; Find the average number of hits per person in the class?
同学们分三个组进行投篮，一组有3人，平均每人投中10个；二组有4人，平均每人投中8个；三组2人，共投中19个．求全班平均每人投中多少个？
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

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

<gadget id="calculator">30 + 32 + 19</gadget>
<output>81</output>

<gadget id="calculator">3 + 4 + 2</gadget>
<output>9</output>

<gadget id="calculator">81 / 9</gadget>
<output>9</output>

<result>9</result>