A piece of chocolate, Xiaodong ate (3/8), Xiaohong ate (2/8), and the rest was given to Xiaoxi, how much of this piece of chocolate did Xiaoxi eat?
一块巧克力，小东吃了(3/8)，小红吃了(2/8)，剩下的都给小西吃，小西吃了这块巧克力的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

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