When Kobayashi was calculating the division, he miswrote the divisor 12 as 21. The resulting quotient was 11 with a remainder of 9. What should be the correct quotient?
小林在计算除法时，把除数12错写成21，结果得到的商是11还余9，正确的商应该是多少．
<gadget id="calculator">11 * 21</gadget>
<output>231</output>

<gadget id="calculator">231 + 9</gadget>
<output>240</output>

<gadget id="calculator">240 / 12</gadget>
<output>20</output>

<result>20</result>