The numerator of the fraction (4/7) is increased to 12. If the size of the fraction is to remain the same, the denominator should be enlarged to the original value.
分数(4/7)的分子增加到12，若要使分数大小不变，分母应扩大到原来的多少．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>