A rectangular piece of paper (3/8) is painted red, (4/8) is painted blue, what percentage of the paper is not painted?
一张长方形的纸(3/8)涂红色，(4/8)涂蓝色，没涂的占这张纸的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (3/8) - (1/2)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>