Xiaohua uses a rope to measure the length of the desk. If you fold it in half, the rope is 0.3 meters longer than the desk; if you fold it in three, the rope is 0.2 meters shorter than the desk. How many meters is the rope long?
小华用一根绳子来测量课桌的长度，两折来量，绳子比课桌还长0.3米；三折来量，绳子比课桌短0.2米．绳子长多少米？
<gadget id="calculator">0.3 + 0.2</gadget>
<output>0.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

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

<result>3</result>