A piece of cake, if mom and dad each eat 1/5 of it, how much of the cake can Xiaoqiao eat?
一块蛋糕，如果爸爸妈妈各吃了它的(1/5)，那么小巧能吃这块蛋糕的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>