The number of boys in the student chorus is 9 less than half the number of girls, and the number of girls is 3 times more than the number of boys. How many people are there in this chorus?
学生合唱队里男生人数比女生人数的一半少9人，女生人数比男生人数的3倍多3人，这个合唱队共有多少人？
<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">27 - 3</gadget>
<output>24</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - 1</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">24 / (1/2)</gadget>
<output>48</output>

<gadget id="calculator">(1/2) * 48</gadget>
<output>24</output>

<gadget id="calculator">24 - 9</gadget>
<output>15</output>

<gadget id="calculator">48 + 15</gadget>
<output>63</output>

<result>63</result>