The average (arithmetic mean) of 4, 8, and 12 equals the average of 6, 10, and
A)5
B)7
C)8
D)9
E)11

Question

Quizplus · Accepted Answer

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.

The Average (Arithmetic Mean) of 4, 8, and 12 Equals