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The average of five numbers is 18. What is their sum?

Correct answer: C. 90

  • A. 72
  • B. 80
  • C. 90
  • D. 95

Explanation

Average = sum ÷ count, so sum = average × count = 18 × 5 = 90. Rearranging this single relation solves nearly every averages question in aptitude papers.

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About Averages

An average represents the total of a set of values divided by the number of values, and a weighted average gives different importance to different groups. Problems involve missing values, combined averages, replacement of observations, and changes in the average, so the total and count must be tracked separately.

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