A piece of iron wire, after (2/3) is used up, there is still (2/3) meters left, how many meters is the original length of this iron wire?
一根铁丝，用去(2/3)以后，还剩下(2/3)米，这条铁丝原来长多少米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/3) / (1/3)</gadget>
<output>2</output>

<result>2</result>