A certain class planted trees under the leadership of the class teacher. The students were just divided into three groups. The teacher and the students planted 1073 trees in total, and the students planted as many trees as the teacher. So how many trees are planted per person on average?
某班在班主任的带领下去植树．学生恰好分成三组，老师和学生共植树1073棵，学生和老师植树一样多．那么平均每人植树多少棵．
<result>29</result>