A piece of rope was used for the first time (1/5) and for the second time (2/5), how much was used for the two times? What fraction is left?
一条绳子，第一次用了(1/5)，第二次用了(2/5)，两次一共用了几分之几？还剩几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

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