80 students in the sixth grade do the same math problem, and 60 of them get it right. What is the error rate of this problem?
六年级80名学生做同一道数学题，做对的有60人，这道题的错误率是多少
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

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

<result>1/4 = around 0.25</result>