A colored ribbon is (5/6) meters long, (1/2) meter is used for the first time, and (1/6) meter is used for the second time, how many meters is the ribbon shorter than before?
一根彩带长(5/6)米，第一次用去(1/2)米，第二次用去(1/6)米，这时彩带比原来短了多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (1/6)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>