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How many liters of a 60% iodine solution need to be mixed with 30 liters of a 30% iodine solution to create a 50% iodine solution?

How many liters of a 60% iodine solution need to be mixed with 30 liters of a 30% iodine solution to create a 50% iodine solution? Correct Answer 60

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How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 35% iodine solution?
How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 35 % iodine solution ?
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