There are 40 students in the third class of five years. In a math test, the average score is 70 points. 10 of them are unqualified, and the average score of the qualified students is 80 points, so what is the average score of the unqualified students?
五年三班有40人，在一次数学测验中，平均分为70分．其中10人不合格，及格同学的平均分是80分，那么不合格同学的平均分是多少分．
<gadget id="calculator">40 * 70</gadget>
<output>2_800</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">80 * 30</gadget>
<output>2_400</output>

<gadget id="calculator">2_800 - 2_400</gadget>
<output>400</output>

<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<result>40</result>