Question

The average weight of a certain number of students in a class is 9 kg. If 5 students A, B, C, D and E join the class, then the average weight of all the student increase
by 1 kg. If the weight of A is 10 kg and the ratio of weight of all five students are 5:6:7:8:9 then find the number of students in the class initially.​

Answer 1

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