Multiple choice

The average of six numbers is 120, if one number is excluded, the average of the remaining 5 numbers is 110. The excluded number is -

  1. $180$
  2. $170$
  3. $160$
  4. $150$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total sum of 6 numbers = 6 × 120 = 720. Sum of remaining 5 numbers = 5 × 110 = 550. Excluded number = 720 - 550 = 170. This is a straightforward average problem.

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