How many hours is (2/5) of half an hour?
半小时的(2/5)是多少小时．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.5 * (2/5)</gadget>
<output>0.2</output>

<result>0.2</result>