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Mathematics, 18.03.2020 00:09 starswarsfan

Yuka earns frequent flyer miles from two airlines. Last year, she flew 20,000 miles with Airline A and 10,000 miles with airline B, and the combined value of her miles was $700. This year, she flew 10,000 miles with Airline A and 20,000 with Airline B, and the combined value of her miles was $800. How much is airline A's miles worth

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