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Mathematics, 10.11.2020 04:50 yurybell

A hot-air balloon is being filled with air. After 20 minutes, the volume of the balloon is 75 cubic feet. After 60 minutes, it’s volume is 120 cubic feet. It takes 3 hours to fill the balloon at this constant rate, and the balloon was not empty initially. How much hot air does the balloon hold, and how much hot air was in the balloon initially?

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