The length of a rope folded in half twice is 5 meters longer than the length of the rope folded in half three times. How many meters is the rope?
一根绳子对折2次后的长度比对折3次后的长度长5米，这根绳子有多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 / (1/8)</gadget>
<output>40</output>

<result>40</result>