A group consists of 150 children. The group is divided into three subgroups A,B and C in the ratio of 2 :5:3 respectively. The average age of the children in the subgroup A is 8 years. The average age of the children in the subgroup B is 10 years. The average age of the children in the subgroup C is 12 years. What is the average age of all the 150 children in the group?

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