题目１００名师生绿化校园，老师每人栽３棵树，学生每２人栽一棵树，共栽树１００棵。求老师与学生各栽多少棵树？解法一：假设１００人全是老师，每人栽３棵树，共栽３×１００＝３００（棵），比实际多栽３００－１００＝２００（棵）。这是因为把学生当作老师，每人多算３ 100 teachers and students green campus, the teacher planted 3 trees per person, students planted a tree for every 2 people, a total of 100 trees planted. Seeking teachers and students how many trees planted? Solution one: Suppose 100 people are all teachers, each planted three trees, planted 3 × 100 = 300 (tree), more than the actual planted 300-100 = 200 (tree). This is because the students as teachers, each more than 3