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The water acidity in a pool is considere...

The water acidity in a pool is considered normal when the average pH reading of three daily measurements is between 7.2 and 7.8. If the first tow pH reading are 7.48 and 7.85, find the range of pH value for the third reading that will result in the acidity level being normal.

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The correct Answer is:
Between 6.27 and 8.07.
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