the average of class in 35 yr. 6 new students with an average age of 33 yr. jo

Question

the average of class in 35 yr. 6 new students with an average age of 33 yr. joined in that class, there by decreasing the average by half year. the original strength of the class was

Options:

A . 11

B . 15

C . 18

D . 21

Answer: Option C
Explanation :

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