The ratio of a ratio is (1/2), its predecessor is (2/5), and what is the latter
一个比的比值是(1/2)，它的前项是(2/5)，后项是多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/5) / (1/2)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>