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In a physics examination, the mean mark of the first twelve students in a class is 60,that of the next twenty students is 50 and the remaining y students is x. what is the mean mark for the whole class in the examination in terms of x and y

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In a physics examination, the mean mark of the first twelve students in a class is 60,that of the ne...

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In a physics examination, the mean mark of the first twelve students in a class is 60,that of the next twenty students is 50 and the remaining y students is x. what is the mean mark for the whole class in the examination in terms of x and y​

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In a physics examination, the mean mark of the first twelve students in a class is 60,that of the next twenty students is 50 and the remaining y students is x. what is the mean mark for the whole class in the examination in terms of x and y