The numerator of (6/8) is reduced by 3, how much should the denominator be reduced to keep the size of the fraction constant
(6/8)的分子减少3，要使分数的大小不变，分母应该减少多少
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

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

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

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

<result>4</result>