Mathematics · Averages

Among four given numbers, the average of the first three numbers is 16 and the average of the last three numbers is 15. If the last number is 25, then the first number should be:

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Among four given numbers, the average of the first three numbers is 16 and the average of the last three numbers is 15. If the last number is 25, then the first number should be:

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Among four given numbers, the average of the first three numbers is 16 and the average of the last three numbers is 15. If the last number is 25, then the first number should be:

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