There are 680 students in Xinxing Primary School, and only 5% of the students have not participated in accident insurance. How many students participate in accident insurance?
新星小学有学生680人，只有5%的学生没有参加意外事故保险．参加意外事故保险的学生有多少人？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">680 * (19/20)</gadget>
<output>646</output>

<result>646</result>