The numerator of (3/8) is increased by 12. How many times should the denominator be enlarged to keep the fraction size constant?
(3/8)的分子增加12，要使分数大小不变，分母应扩大多少倍
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>