There is a rope. If it is folded in half and then folded in half again, the length is 6.15 cm. What is the original length of the rope in centimeters?
有一根绳子，如果把这它对折、再对折后的长度是6.15厘米，这根绳子原来长多少厘米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6.15 / (1/4)</gadget>
<output>24.6</output>

<result>24.6</result>