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Age Problems

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Multiple Choice

The sum of the ages of X and Y is 45 years, the sum of the ages of Y and Z is 55 years. And the sum of the ages of X and Z is 65 years. What is the age of Y in years?

  1. 17.5
  2. 27.5
  3. 37.5
  4. 19.5
  5. none
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