A certain class of students planted trees under the leadership of the head teacher, and the students were just divided into three groups on average. If the teacher and the students planted the same number of trees each, and a total of 1073 trees were planted, how many trees did each person plant on average?
某班同学在班主任老师带领下去种树，学生恰好平均分成三组，如果老师与学生每人种树一样多，共种了1073棵，那么平均每人种了多少棵树．
<result>29</result>