The average score of the whole class in the mathematics test is 85 points, and 4/5 of them pass. The average score of the passing students is 93 points. What is the average score of the failing students?
数学考试全班平均分为85分，其中有4/5的人及格，及格同学的平均分是93分，那么不及格同学的平均分是多少分．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">93 * (4/5)</gadget>
<output>372/5 = around 74.4</output>

<gadget id="calculator">85 - (372/5)</gadget>
<output>53/5 = around 10.6</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(53/5) / (1/5)</gadget>
<output>53</output>

<result>53</result>