bamboo pole is inserted into a pool, the part that enters the mud is 2 meters long, and the part that is exposed to the water is 5 meters long. The total length of the bamboo pole is 18 meters. What fraction of the length of the bamboo pole is the depth of the water in the pool?
一根竹竿插入水池中，入泥部分长2米，露出水面部分长5米，竹竿共长18米，池中水的深度是竹竿长度的几分之几？
<gadget id="calculator">18 - 2 - 5</gadget>
<output>11</output>

<gadget id="calculator">11 / 18</gadget>
<output>11/18 = around 0.611111</output>

<result>11/18 = around 0.611111</result>