If a rope is folded 3 times more than 50 times, the length of the rope is 2 meters. What is the length of the rope?
一条绳子3折比5折后每折多2米，这条绳子长多少米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">2 / (2/15)</gadget>
<output>15</output>

<result>15</result>