A rope is cut off by 20% and then connected to 6m. The result is 1.5m longer than the original rope. How many meters is the original length of the rope?
一根绳子，截去20%以后，再接上6m，结果比原来的绳子长1.5m，这根绳子原来长多少米？
<gadget id="calculator">6 - 1.5</gadget>
<output>4.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4.5 / (1/5)</gadget>
<output>22.5</output>

<result>22.5</result>