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[" 19.There are "30" students in a class...

[" 19.There are "30" students in a class.The average age of the first "10" students is "12.5" years.The average "],[" age of the next 20students is "13.1" years.The average age of the whole class is "],[[" (a) "11.6" years "," (b) "12.3" years "," (c) "13.5" years "," (d) "12.9" years "]]

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