There is a rope. If it is folded in half and then folded in half again, the length after being folded twice is 2.25 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，折两次次后的长度是2.25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">2.25 / (1/4)</gadget>
<output>9</output>

<result>9</result>