A barrel of oil uses 45, and then adds 15 kg. At this time, the gasoline in the barrel is exactly 12 times of that in the whole barrel. How many kg of gasoline is this barrel?

15 △ 12 - (1-45)] = 15 △ 12-15] = 15 △ 310 = 50 (kg) a: this barrel of gasoline is originally 50 kg

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