The numerator of (2/5) is increased by 6. How many times should the denominator be expanded to keep the fraction size unchanged?
(2/5)的分子增加6，要使分数大小不变，分母应扩大到原来的多少倍
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

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

<result>4</result>