A rope is 5 meters long, (3/5) of it is used for the first time, (1/6) of it is used for the second time, and a fraction of it is left.
一条绳子长5米，第一次用去它的(3/5)，第二次用去它的(1/6)，还剩它的几分之几．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (3/5) - (1/6)</gadget>
<output>7/30 = around 0.233333</output>

<result>7/30 = around 0.233333</result>