After Xiaohua drank (1/3) of a glass of water, how much is left?
一杯水，小华喝了(1/3)后，还剩几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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