A length of rope is 3 meters longer than that of four pieces. What is the total length of the rope?
一段绳子折成三段比折成四段多3米，这根绳子总长多少米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3 / (1/12)</gadget>
<output>36</output>

<result>36</result>