If (2/5)x=0.5y, (x, y are not 0), then x:y=how much
如果(2/5)x=0.5y，(x，y都不为0)，那么x：y=多少
<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>