Question on: JAMB Mathematics - 2012

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
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Correct Option: D
\(\frac{x}{7} = \frac{96}{1}\) ==> \(\frac{672 + x}{8} = 112\)

Therefore x = 224

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