A -25- litres cylinder contains a mixture of oxygen and nitro gen, the volume of oxygen be ing 25% of total volume. A few litres of the mixture is released and an equal amount of nitro gen is added. Then the same amount of the mixture as before is released and replaced by ni trogen for the second time. As a result the oxygen content be comes 9% of the total volume. How many litres of mixture is released each time?
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answer ok
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25 litres ok my friend
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