Xiao Ming ate (1/8) of a watermelon, how much is left?
一个西瓜，小明吃了(1/8)，还剩多少？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>