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The mean of seven numbers is 96. If an eighth number is added, the mean…

The mean of seven numbers is 96. If an eighth number is added, the mean becomes 112. Find the eighth number.
  • A.
    126
  • B.
    180
  • C.
    216
  • D.
    224
Correct Answer: Option D
Explanation

(frac{x}{7} = frac{96}{1}) ==> (frac{672 + x}{8} = 112)
Therefore x = 224