A pizza, mom and dad each eat it (2/5), Xiaohong eats the rest, how much of the pizza does Xiaohong eat?
一个比萨饼，爸爸妈妈各吃它的(2/5)，小红把剩下的都吃了，小红吃了这个比萨饼的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>