In class 2 of the sixth grade, 45 students passed the mid-term examination and 5 failed. What is the passing rate of the mid-term examination for this class?
六年级2班在期中考试中有45人的成绩合格，有5人不合格，这个班期中考试的合格率是多少．
<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>