A piece of chocolate, Lily ate (1/4), how much is left?
一块巧克力，莉莉吃了(1/4)，还剩多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>