(1/5) of a rectangular paper is painted blue, (3/5) is painted red, what percentage of the paper is the part that is not colored?
一张长方形纸的(1/5)涂蓝色，(3/5)涂红色，没有涂色的部分占这张纸的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (1/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

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