SOLUTION: x+y =10 y+z = 15 x+z = 17
What is the average (arithmetic mean) of x, y and z ?
(A) 21 (B) 17 (C) 15 (D) 7 (E) It cannot be determined from t
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Question 253011: x+y =10 y+z = 15 x+z = 17
What is the average (arithmetic mean) of x, y and z ?
(A) 21 (B) 17 (C) 15 (D) 7 (E) It cannot be determined from the information given
Answer by hokies(65) (Show Source): You can put this solution on YOUR website!
Add all 3 equations:
2x+2y+2z = 42
x+y+z = 21
(x+y+z)/3 = 7
The answer is 7
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