Add 6 to the former term of 3:11, how much should be added to the latter term to keep the ratio constant
将3：11的前项加6，要使比值不变，后项应加上多少
<gadget id="calculator">11 * 3</gadget>
<output>33</output>

<gadget id="calculator">33 - 11</gadget>
<output>22</output>

<result>22</result>