If the former term of a ratio is enlarged by 2 times and the latter term is reduced by 4 times, then the ratio will be enlarged by how many times the original ratio
将一个比的前项扩大2倍，后项缩小4倍，那么比值就扩大原比值的多少倍
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / (1/4)</gadget>
<output>8</output>

<result>8</result>