The average of 9 observations was 9

Ask n AnswerCategory: ArithmeticThe average of 9 observations was 9
vasista Staff asked 1 year ago
The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?
A. 6
B. 7
C. 8
D. 9
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