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Основы математики Иннполис
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Mixing 30% and 60% acid solutions and adding 10 kg of pure water results in a 36% acid solution. If instead of 10 kg of water, 10 kg of a 50% acid solution of the same acid is added, a 41% acid solution is obtained. How many kilograms of the 30% solution were used to prepare the mixture?
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