Add 3 to the numerator of (3/5), how many times should the denominator be enlarged to keep the size of the fraction unchanged.
(3/5)的分子加上3，要使分数大小不变，分母应扩大多少倍．
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<result>2</result>