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SSC MTS 2024 · PYQ · Average · medium

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

Answer

The correct answer is D: 11. Sum of 9 numbers = 3 × 9 = 27. Sum of first 8 numbers = 2 × 8 = 16.

  1. A.12
  2. B.15
  3. C.14
  4. D.11✓ Correct

Explanation

Sum of 9 numbers = 3 × 9 = 27. Sum of first 8 numbers = 2 × 8 = 16. The 9th number = 27 − 16 = 11.
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