A bundle of wires is 60 meters long, the first time uses up the full length (1/3), and the second time uses up the full length (1/6), what fraction of the full length is left?
一捆电线长60米，第一次用去全长的(1/3)，第二次用去全长的(1/6)，还剩下全长的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 - (1/3) - (1/6)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>