Xiaoming has 5 apples, he gives 1 to Xiaohong, Xiaohong eats half of it for Xiaodong, Xiaodong eats half for Teacher Cang, how many apples did Teacher Cang eat?
小明有5个苹果，他分了1个给小红，小红吃了一半给小东吃，小东吃了一半给苍老师吃，苍老师吃了几个苹果？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

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