There are 47 students in Class 51, 13 of them have participated in the mathematics ability test. What percentage of the total number of students in the class take the test?
五1班有学生47人，其中13人参加了数学能力测试，参加测试人数占全班人数的几分之几？
<gadget id="calculator">13 / 47</gadget>
<output>13/47 = around 0.276596</output>

<result>13/47 = around 0.276596</result>