If the numerator of (2/9) is increased by 6, how much should the denominator be increased so that the size of the fraction will not change.
(2/9)的分子增加6，分母应增加多少，分数的大小才不会改变．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 - 9</gadget>
<output>27</output>

<result>27</result>