In 13:24, the former term of the ratio is increased by 7. To keep the ratio constant, how does the latter term change?
在13：24中，比的前项增加7，要使比值不变，后项怎样变化？
<gadget id="calculator">20 / 13</gadget>
<output>20/13 = around 1.538462</output>

<result>20/13 = around 1.538462</result>