A bamboo pole is inserted vertically into a pool. After measurement, the wet part is 4 decimeters longer than half the length of the bamboo pole, and the length of the unwet part is 12 decimeters. How deep is this pool?
一根竹竿，将它垂直插入一个水池，经过测量，潮湿部分比竹竿全长的一半多4分米，未潮湿部分长12分米，这个水池深多少分米？
<gadget id="calculator">12 + 4 + 4</gadget>
<output>20</output>

<result>20</result>