Mathematics
JAMB 2012
The mean of seven numbers is 96. If an eighth number is added, the mean becomes 112. Find the eighth number.
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A.
126
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B.
180
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C.
216
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D.
224
Correct Answer: Option D
Explanation
\(\frac{x}{7} = \frac{96}{1}\) ==> \(\frac{672 + x}{8} = 112\)
Therefore x = 224
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