Xiaoqiang's birthday cake was eaten (5/8), how much is left to eat.
小强的生日蛋糕被吃掉了(5/8)，还剩多少没有吃．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>