Multiple choice

Average of 7 numbers is 8. If a number is added then average becomes 9. what is the value of added number.

  1. 12

  2. 11

  3. 16

  4. 14

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average of 7 numbers is 8, so sum = 7 × 8 = 56. When an 8th number is added, the average becomes 9, so new sum = 8 × 9 = 72. The added number = 72 - 56 = 16. The new number must be greater than the old average to increase the average.

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