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JAMB 2012 · UTME · Q43

The mean of seven numbers is 96. If an eighth number is added, the mean becomes 112. Find the eighth number.

Worked solution (try it first)
  1. Total of the seven numbers: 7×96=6727 \times 96 = 672.
  2. Total of all eight: 8×112=8968 \times 112 = 896.
  3. The eighth number is the difference: 896−672=224896 - 672 = 224, option D.

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