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李刚与王强正在讨论一个问题:学校有两支体操队。第一队有12人,平均身高135厘米;第二队有13人,平均身高140厘米。这两队同学的平均身高是多少厘米?李刚的解答方法是:因为两队
Li Gang and Wang Qiang are discussing a problem: the school has two gymnastics teams. The first team has 12 people, an average height of 135 cm; the second team has 13 people, the average height of 140 cm. The average height of these two teams of students is how many centimeters? Li Gang’s answer is: Because of the two teams