Mathematics, 09.01.2021 02:20 JLapworth1130

The average age of a group of 30 children is 10.3 years. The average age of another group of 50 children is 8.7 years. Find the average age for all of the 80 children

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The average age of a group of 30 children is 10.3 years. The average age of another group of 50 chil...

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