Students do radio exercises. There are 8 rows in total. There are 4 people in the first row. After that, each row has 1 more people than the previous row. How many people do radio exercises in total?
同学们做广播操，一共排了8排，第一排有4人，以后每排比前一排多1人，一共有多少人做广播操？
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<gadget id="calculator">32 + 28</gadget>
<output>60</output>

<result>60</result>