In a math test, the average score of the whole class in Class 61 is 90, the average score of boys is 88.5, and the average score of girls is 92. There are 18 girls in this class, how many boys are there?
一次数学测验，六1班全班平均90分，男生平均88.5分，女生平均92分，这个班女生有18人，男生有多少人．
<gadget id="calculator">92 * 18</gadget>
<output>1_656</output>

<gadget id="calculator">90 * 18</gadget>
<output>1_620</output>

<gadget id="calculator">1_656 - 1_620</gadget>
<output>36</output>

<gadget id="calculator">90 - 88.5</gadget>
<output>1.5</output>

<gadget id="calculator">36 / 1.5</gadget>
<output>24</output>

<result>24</result>