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The average of nine numbers 6,2-x,8,3x-2,5,9,2,7,18 is 11. Then x is equal to
?1. 20
?2. 5.5
?3.? 13
?4. 22

The average of nine numbers 6,2-x,8,3x-2,5,9,2,7,18 is 11. Then x is ...

The average age of a class of 20 children is 11 years 3 months and the ...

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