Question
The average of 9 numbers is 3. If the average of the
first 8 of these numbers is 2, the 9 th number is:Solution
Given: Average of 9 numbers = 3 ⇒ Total = 9 × 3 = 27 Average of first 8 numbers = 2 ⇒ Total = 8 × 2 = 16 9th number = 27 − 16 = 11
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