There is a rope. If it is folded in half and then folded in half again, the length after being folded three times is 6.375 centimeters. 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，折三次后的长度是6.375厘米，这根绳子原来长多少厘米．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">6.375 / (1/8)</gadget>
<output>51</output>

<result>51</result>