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When a person aged 39 is added to a group of n people, the average age increases by 2. When a person aged 15 added instead, the average age decreases by 1. The value of n is 7

Answer» When a person aged 39 is added to a group of n people, the average age increases by 2. When a person aged 15 added instead, the average age decreases by 1. The value of n is
  1. 7


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