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1. The average of x and another number is z. the other number must be ----
- A. z-x
- B. z-x
- C. z-x
- D. z-x
Answer: Option C
Explanation:
The average of x and another number is z.
Sum of x and the other number is = 2z
so, the other number must be = 2z - x
ans: 2z - x
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