There are 45 students in the sixth grade class. In a math test, the average score of the whole class is 91.2 points, among which the average score of girls is 92 points, and the average score of boys is 90.5 points. How many more boys than girls? How many
六年级一班一共有学生45名，在一次数学考试中，全班的平均成绩是91.2分，其中女生的平均成绩是92分，男生的平均成绩是90.5分．则男生比女生多几人？多少
<gadget id="calculator">45 * 92</gadget>
<output>4_140</output>

<gadget id="calculator">91.2 * 45</gadget>
<output>4_104</output>

<gadget id="calculator">4_140 - 4_104</gadget>
<output>36</output>

<gadget id="calculator">92 - 90.5</gadget>
<output>1.5</output>

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

<gadget id="calculator">45 - 24</gadget>
<output>21</output>

<gadget id="calculator">24 - 21</gadget>
<output>3</output>

<result>3</result>