Chickens are less than ducks (2/5), then ducks are more than chickens ((())/(())).
鸡比鸭少(2/5)，那么鸭比鸡多((())/(()))．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>