piece of rectangular paper, (1/5) is used the first time, and the same amount is used the second time. How much of this paper is used twice?
一张长方形纸，第一次用去它的(1/5)，第二次用去的与第一次同样多．两次一共用去这张纸的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) + (1/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>