The physical fitness test of a class of sixth grade students is divided into two grades: "passed" and "failed". Among them, 45 students are qualified and 5 are unqualified. What is the passing rate of this test?
六年级某班学生身体素质检测，分"合格"与"不合格"两个等级，其中合格的有45人，不合格的有5人，这次检测的合格率是多少
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">45 / 50</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>