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3 math Companies: X,Y and Z, take an survey on employee performance. The average performance in Company X is 83.The average performance in Company Y is 76.The average performance in Company Z is 85.The average performance of all employees in companies X and Y together is 79.The average performance of all employees in Company Y and Z together is 81.What is the average performance of all employee of Company?

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3 math Companies: X,Y and Z, take an survey on employee performance. The average performance in Company X is 83.The average performance in Company Y is 76.The average performance in Company Z is 85.The average performance of all employees in companies X and Y together is 79.The average performance of all employees in Company Y and Z together is 81.What is the average performance of all employee of Company?






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