If 14 is added to the former item of 7:8, how much should be added to the latter item to keep the ratio unchanged.
如果7：8的前项加上14，要使比值不变，后项应加上多少．
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>