Two classes take an exam with an average score of 81. There are 25 students in the first class with an average score of 74. There are 35 students in the second class. What is the average score?
两个班参加一次考试，平均成绩为81分，第一班25人，平均分为74分，第二班共35人，平均分为多少分
<gadget id="calculator">81 * 25</gadget>
<output>2_025</output>

<gadget id="calculator">81 * 35</gadget>
<output>2_835</output>

<gadget id="calculator">74 * 25</gadget>
<output>1_850</output>

<gadget id="calculator">2_835 - 1_850</gadget>
<output>985</output>

<gadget id="calculator">2_025 + 985</gadget>
<output>3_010</output>

<gadget id="calculator">3_010 / 35</gadget>
<output>86</output>

<result>86</result>