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The average weight of a class of student...

The average weight of a class of students is `67.5 kg.` The weight of the class teacher is `25%` more than the average weight of the class. The average weight of the class is less than the class teacher by `x%.` The value of x is :

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The average weight of a class of 40 students is 30 and the average weight of a class of 20 students is 15. Find the average weight of both the combined classes :

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