bag of rice, eat (1/2) of this bag of rice on the first day, eat (1/2) of the first day on the second day, how much of this bag of rice is eaten on the second day.
一袋大米，第一天吃了这袋大米的(1/2)，第二天吃了是第一天的(1/2)，第二天吃了这袋大米的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>