A piece of rope was used for the first time (4/6) and for the second time (1/6), how much was used for the two times? What fraction is left?
一条绳子，第一次用了(4/6)，第二次用了(1/6)，两次一共用了几分之几？还剩几分之几？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>