In 6:11, if the former item is multiplied by 3, how much should be added to the latter item, and the ratio remains unchanged.
在6：11中，如果前项乘3，后项应加上多少，比值不变．
<gadget id="calculator">11 * 3</gadget>
<output>33</output>

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

<result>22</result>