When the former term of the ratio is 4, if the former term is increased by 8, how much should the latter term be multiplied to keep the ratio constant
当比的前项是4，如果前项增加8，要使比值不变，后项应乘多少
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>