3) The average age of 30 students in a class
is 12 years. If another 6 students whose
average age is 15 years are also joined
in this class, now the average age of all
students is.
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3) The average age of 30 students in a class
is 12 years. If another 6 students whose
average age is 15 years are also joined
in this class, now the average age of all
students is.
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Answer:
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