There are 40 students in a class today. When the test is conducted with two kinds of test questions, A and B, 27 people pass the A question, and 15 people pass both the A and B questions. There are 5 people who failed both questions A and B. Let question A be 70 points and question B be 30 points, what is the average score of this class.
今有40人的班级，用A、B两种试题进行测验时，通过A题的为27人，A、B两题都通过的为15人．A、B两题都没通过的为5人．设A题为70分，B题为30分，则这个班级的平均分是多少分．
<gadget id="calculator">100 * 15</gadget>
<output>1_500</output>

<gadget id="calculator">27 - 15</gadget>
<output>12</output>

<gadget id="calculator">70 * 12</gadget>
<output>840</output>

<gadget id="calculator">40 - 5 - 27</gadget>
<output>8</output>

<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<gadget id="calculator">1_500 + 840 + 240</gadget>
<output>2_580</output>

<gadget id="calculator">2_580 / 40</gadget>
<output>129/2 = around 64.5</output>

<result>129/2 = around 64.5</result>