Math Olympiad for Elementary | 2019 | Division E | Contest 3 | MOEMS | 3C

Problem: In a family, there are four children. Adam's age is the sum of Beth's and Carol's. Four years ago, David's age was the sum of Beths age and Carol's age then. Eight years ago, Adam's age was twice David's age then. Who is the oldest child in this family?

Key: Observation and logic

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