Some trees were planted around the pool. Dongdong and Xiaoyue walked around the pool in a clockwise direction, counting the trees while walking. Since the two started from different places, the 20th tree counted by Dongdong was the 20th tree counted by Xiaoyue. There are 7 trees, and the 7th tree in Dongdong's number is the 94th tree in Xiaoyue's place. May I ask: How many trees are planted around the pool?
水池周围种了一些树，冬冬和小悦沿顺时针方向绕水池散步，边走边数树的棵数，由于两人的出发地点不同，因此冬冬数的第20棵在小悦那儿是第7棵，冬冬数的第7棵在小悦那儿是第94棵．请问：水池四周一共种了多少棵树？
<gadget id="calculator">20 - 7</gadget>
<output>13</output>

<gadget id="calculator">13 - 7</gadget>
<output>6</output>

<gadget id="calculator">94 + 6</gadget>
<output>100</output>

<result>100</result>