There are 38 students in Class 5 and 3, 9 of them take part in Mathematical Olympiad class, 17 take part in composition class, and the rest take part in reading class. How much do the students in the reading class account for in the whole class?
五3班有38人，有9人参加奥数班，17人参加作文班，其余同学参加阅读班．阅读班的同学占全班人数的几分之几？
<gadget id="calculator">38 - 17 - 9</gadget>
<output>12</output>

<gadget id="calculator">12 / 38</gadget>
<output>6/19 = around 0.315789</output>

<result>6/19 = around 0.315789</result>