A quantity of solution that is 3% salt by volume was mixed with a quantity of solution that is 9% salt by volume to produce a quantity of solution that is 4% salt by volume. How many liters of the 9% solution were used?
(1) The quantity of 3% solution was 5 times the quantity of 9% solution.
(2) The quantity of 4% solution produced was 150 liters.
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