The numerator of (2/9) is increased by 6, what should be the denominator to keep the size of the fraction constant?
(2/9)的分子增加6，要使分数大小保持不变，分母应为多少．
<gadget id="calculator">2 + 6</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>