The numerator of (3/7) is increased by 6, how many times should the denominator be enlarged to keep the fraction size unchanged?
(3/7)的分子增加6，要使分数大小不变，分母扩大多少倍
<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>