How many hours is 4:30?
4时30分等于多少时．
<gadget id="calculator">30 / 60</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 + (1/2)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>