A rope is 10 meters and 6 decimeters. After 2 meters and 9 decimeters are used up, the rest is divided into 7 sections on average. How many decimeters are each section long?
一根绳子10米6分米，用去2米9分米后，剩下的平均分成7段，每段长是多少分米？
<gadget id="calculator">106 - 29</gadget>
<output>77</output>

<gadget id="calculator">77 / 7</gadget>
<output>11</output>

<result>11</result>