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      Question

      What approximate value

      will replace the question mark (?) in the following? √400.5 + √? – ³√728.9 = √324.2
      A 27 Correct Answer Incorrect Answer
      B 81 Correct Answer Incorrect Answer
      C 67 Correct Answer Incorrect Answer
      D 49 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      √400.5 + √? – ³√728.9 = √324.2 √400 + √? – ³√729 ~ √324 20 + √? – 9 ~ 18 √? ~ 7 ? ~ 49

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