A rope, (2/9) of it is used up, exactly (2/3) meter is used up, how many meters is the original length of the rope?
一根绳子，用去它的(2/9)，正好用去了(2/3)米，这根绳子原来长多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/3) / (2/9)</gadget>
<output>3</output>

<result>3</result>