A piece of chocolate, I ate (1/8) of it and gave (5/8) to Xiao Fei, how much is left?
一块巧克力，明明吃了它的(1/8)，把(5/8)送给了小飞，还剩下几分之几？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (1/8) - (5/8)</gadget>
<output>1/4 = around 0.25</output>

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