When Naughty calculated the division, he wrote the divisor 81 as 18, and the resulting quotient was 9. What is the correct quotient?
淘气在计算除法时，把除数81写成了18，结果得到的商是9，正确的商是多少．
<gadget id="calculator">18 / 81</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">9 * (2/9)</gadget>
<output>2</output>

<result>2</result>