In a math test, the average score of the class 61 was 92, the average score of the boys was 93, and the average score of the girls was 91.2. There are 25 girls in this class. How many boys are there?
一次数学测验，六1班全班平均92分，男生平均93分，女生平均91.2分，这个班女生有25人，问这个男生有多少人？
<gadget id="calculator">92 * 25</gadget>
<output>2_300</output>

<gadget id="calculator">91.2 * 25</gadget>
<output>2_280</output>

<gadget id="calculator">2_300 - 2_280</gadget>
<output>20</output>

<gadget id="calculator">93 - 92</gadget>
<output>1</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<result>20</result>