If (1/2)x=(2/5)y, then x:y=how much.
若(1/2)x=(2/5)y，那么x：y=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>