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In class 12 there are 8 students. In class 11 there are 6 students .In class 10 there are 5 students . Total ways of selecting 10 students , such that there are at least 2 students from each class and at most 5 students from 11 students of Class 10 and 11 combined is 100k. Then find value of k

In a class of 60 students, the average age of 25 girls is 12 yr and boys is 14 yr. Two of the students aged 16 and 14 yr leave the class and are replaced by 3 students of ages 12,11 and 10 yr, Find the change in average age of the class.