Some trees were planted around the pond. Xiaoming and Xiaoying walked around the pond in the same direction, counting trees while walking. Since the starting points of the two are different, the 20th tree of Xiao Ming's number is the 7th tree in Xiao Hong's place; the 7th tree of Xiao Ming's number is the 94th tree in Xiao Hong's place. How many trees are planted around the pond?
池塘周围栽了一些树，小明和小颖沿同一方向绕水池散步，边走边数树的棵树．由于两人出发地点不同，因此小明数的第20棵是小红那里的第7棵；小明数的第7棵在小红那里是第94棵．求池塘四周栽了多少棵树？
<gadget id="calculator">13 - 7</gadget>
<output>6</output>

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

<result>100</result>