Xiao Ming did 30 questions and got 3 wrong. What is his correct rate?
小名做了30道题，做错了3道，他的正确率是多少．
<gadget id="calculator">30 - 3</gadget>
<output>27</output>

<gadget id="calculator">27 / 30</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>