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The average age of a class of 40 boys was 20 years - the average age of 12 of them was 22 years and that of another 18 was 17 years. Find the average age of the remaining boys?

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The average age of a class of 40 boys was 20 years - the average age of 12 of them was 22 years and that of another 18 was 17 years. Find the average age of the remaining boys?






 
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