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Right now Seth’s age is 4/5 the age of his brother Eric. Twenty-one years ago, Eric was twice as old as Seth. What are their ages now?

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Answer: We are told that 21 years ago, Eric was twice as old as Seth. So, Eric was 2{(4/5)x-21} years old 21 years ago (just multiply Seth's age 21 years ago by 2).

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