A piece of cake, the younger brother ate (2/6), and there is a fraction left.
一块蛋糕，弟弟吃了(2/6)，还剩几分之几．
<gadget id="calculator">2 / 6</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>