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At a festival, spherical balloons with a radius of 290 cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25°C and must be heated to 100°C to make the balloons float. 2.00 kg of butane (C4H10) fuel are available to be burned to heat the air. Calculate the maximum number of balloons that can be inflated with hot air.