There are 680 students in Hope Primary School, and 95% of them have purchased insurance. How many students do not have insurance?
希望小学有学生680人，其中有95%的学生买了保险，没有买保险的学生有多少人？
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">680 * (1/20)</gadget>
<output>34</output>

<result>34</result>