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1. The average (arithmetic mean) of x and y is 20. If x = 5 what is the average of x. y and z?
- A. 15
- B. 15
- C. 15
- D. 15
Answer: Option A
Explanation:
Sum of x and y = 20×2 = 40
Average of x, y and z = (40 + 5)/3 = 15.
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