Practice Quiz

SAT Math Practice Exam

Category - Mathematics - Hard

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The average (arithmetic mean) of 4, 8, and 12 equals the average of 6, 10, and
  1. 5
  2. 7
  3. 8
  4. 9
  5. 11
Explanation
Answer C : Assume the third number is x
The average of 4, 8, and 12 = The average of 6, 10, and x
The total of 4, 8, and 12 = The total of 6, 10, and x
4 + 8+ 12 = 6+ 10 +x
24 = 16 + x or x =8

Key takeaway: The average ( arithmetic mean ) of a set of numbers is their sum divided by the number of numbers in the set. For average problems, think Total divided by number of items.
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