In a math test, the average score of the class 61 was 91, the average score of the boys was 89, and the average score of the girls was 92.5. There are 24 girls in this class. How many boys are there?
一次数学测验，六1班全班平均91分，男生平均89分，女生平均92.5分，这个班女生有24人，问这个男生有多少人？
<gadget id="calculator">92.5 * 24</gadget>
<output>2_220</output>

<gadget id="calculator">91 * 24</gadget>
<output>2_184</output>

<gadget id="calculator">2_220 - 2_184</gadget>
<output>36</output>

<gadget id="calculator">91 - 89</gadget>
<output>2</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>