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in an airline fleet, 10 aircraft are 30 years old, 20 aircraft are 15 years old, and 5 aircraft are 5 years old. What is

in an airline fleet, 10 aircraft are 30 years old, 20 aircraft are 15 years old, and 5 aircraft are 5 years old. What is the average age of the fleet? (Round your answer to the nearest tenth. )

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