the average marks of a class of 30 students is 40 and that of another class of

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the average marks of a class of 30 students is 40 and that of another class of 50 students is 60. find the average marks of all the students?

Options:

A . 50

B . 47.5

C . 59

D . 52.5

Answer: Option D
Explanation :

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