Xiao Pang and Xiao Ding Ding used a rope to measure an ancient tree. They wound the rope four times, and there was still a difference of 0.55 meters. As a result, they changed it to three times, but there was an extra 1.65 meters. How long is it?
小胖和小丁丁用一根绳子测量一棵古树，他们用绳子绕了四圈，还差0.55米，结果他们又改成绕三圈，却又多出1.65米，这棵古树的周长是多少？
<gadget id="calculator">0.55 + 1.65</gadget>
<output>2.2</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">2.2 / 1</gadget>
<output>2.2</output>

<result>2.2</result>