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Can you explain how to solve such type of statistics questions? It would be great help if you can explain variation of such questions as

Can you explain how to solve such type of statistics questions?
It would be great help if you can explain variation of such questions as well.
A class has 60 students of which 25 are taught by teacher A and 35 are taught by teacher B. The class average (mean) mark for all the students is a and the mean mark for the students taught by teacher A is A. The mean mark for students taught by teacher Bag is Select one: 60x -250 A 35 35x+250 A 60 35x-250 A 60 25x-350A 25

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