In an exam, the average score of Class 1 is 80, the average score of Class 2 is 75, and the average score of Class 2 is 78. If Class 1 has 12 more students than Class 2, how many students are there in Class 2?
一次考试，一班的平均分为80分，二班的平均分为75分，两班的平均分为78分，若一班比二班多12人，则两班共有多少人．
<gadget id="calculator">80 * 12</gadget>
<output>960</output>

<gadget id="calculator">78 * 12</gadget>
<output>936</output>

<gadget id="calculator">960 - 936</gadget>
<output>24</output>

<gadget id="calculator">78 - 80 - 75</gadget>
<output>-77</output>

<gadget id="calculator">78 + (-77)</gadget>
<output>1</output>

<gadget id="calculator">24 / 1</gadget>
<output>24</output>

<gadget id="calculator">24 + 12 + 24</gadget>
<output>60</output>

<result>60</result>