The average score of a test in a certain class is 70 points, among which (3/4) of the students passed, their average score is 80 points, what is the average score of the students who failed.
某班级一次考试的平均分，是70分，其中(3/4)的同学及格，他们的平均分是80分，不及格同学的平均分是多少分．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">80 * (3/4)</gadget>
<output>60</output>

<gadget id="calculator">70 - 60</gadget>
<output>10</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">10 / (1/4)</gadget>
<output>40</output>

<result>40</result>