# CBSE Class 11-science Answered

**The water acidity in a pool is considered normal when the average pH reading of three daily measurements is between 9.2 and 9.8. If first two pH readings are 9.48 and 9.85, find the range of pH value for the third reading that will result in the acidity level being normal.**

Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM

Expert Answer

Let the third reading be x

_{}

_{}

_{ 27.6 < 19.33 + x < 29.4}

_{ 27.6 – 19.33 < x < 29.4 - 19.33}

_{ 8.27 < x < 10.07}

_{}Range of pH value for third reading is 8.27 to 10.07

Answered by | 04 Jun, 2014, 03:23: PM

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