Add 8 to the denominator of (3/8), how much should the numerator be multiplied to keep the size of the fraction constant
(3/8)的分母加上8，要使分数的大小不变，分子应乘上多少
<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<gadget id="calculator">16 / 8</gadget>
<output>2</output>

<result>2</result>