In 2:5, if the former term is increased by 8, how much should the latter term be increased to keep the ratio constant
在2：5中，如果前项增加8，要使比值不变，后项应该增加多少
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<result>20</result>