The average age of 12 boys is 10 years out of these the average age of 11 boys is 9 years find the age of 12thbiys
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Answer:
21
Step-by-step explanation:
average of 12th boy is given by...
first find average sum of all 12 boys and do same for 11 boy and then subtract them to find the age of 12th boy.
12×10-11×9 = 21
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