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The average of 9 numbers is 3. If the average of the first 8 of these numbers is 2, the 9 th number is:

A11

B12

C14

D15

Answer:

A. 11

Read Explanation:

Average of 9 numbers = 3
So, sum of 9 numbers:
9×3=279 \times 3 = 27

Average of first 8 numbers = 2
So, sum of first 8 numbers:
8×2=168 \times 2 = 16

9th number:

27 - 16 = 11

Final Answer: 11


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