In 3:5=12:20, the former term of the first ratio is increased by 8, how to change the latter term of the second ratio so that the ratio can be established?
在3：5=12：20中，第一个比的前项增加8，第二个比的后项怎样变化，才能使比例成立？
<gadget id="calculator">3 / 11</gadget>
<output>3/11 = around 0.272727</output>

<result>3/11 = around 0.272727</result>