The mean of seven numbers is 96 If an eighth nu... - JAMB Mathematics 2012 Question
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 option: d
\(\frac{x}{7} = \frac{96}{1}\) ==> \(\frac{672 + x}{8} = 112\)
Therefore x = 224
Therefore x = 224
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