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Number of students in 4th and 5th class in the ratio 6:11. 40% in class 4 are girls and 48% in class 5 are girls. What percentage of students in both the classes are boys ?

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