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Multiple choice

The average of 6 numbers is 20. If a new number is added, the average increases by 10%. What is the new number?

  1. 27

  2. 32

  3. 34

  4. 35

  5. 38

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average of 6 numbers = 20, so sum = 6 × 20 = 120. New average = 20 + 10% of 20 = 22. Sum of 7 numbers = 7 × 22 = 154. New number = 154 - 120 = 34. The new number is 34.

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