Class Four 1 has 33 people, Class Four 2 has 31 people, Class Four 3 has 29 people. How many people do they have on average per class?
四1班有33人，四2班有31人，四3班有29人．他们平均每班有多少人？
<gadget id="calculator">33 + 31 + 29</gadget>
<output>93</output>

<gadget id="calculator">93 / 3</gadget>
<output>31</output>

<result>31</result>