There are 45 people in the class who get a math problem right and 5 people get it wrong. What is the correct rate for the whole class to answer this math problem?
一道数学题，全班有45人做对，5人做错，这道数学题全班解答正确率是多少？
<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>