In a math test in class 6 and 2, 45 people in the class passed and 5 people failed. What is the passing rate of this math test?
六2班的一次数学考试，全班有45人及格，5人不及格，这次数学考试的及格率是多少．
<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>