There is a rope 300 meters long, 210 meters are used, and the rest is cut into 5 sections. How many meters is each section on average?
有一根绳子长300米，用去210米，剩下的剪成5段，平均每段多少米？
<gadget id="calculator">300 - 210</gadget>
<output>90</output>

<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<result>18</result>