Sarah is making a fruit punch. The recipe calls for a ratio of 3 parts orange juice to 2 parts pineapple juice. If she wants to make a total of 10 liters of fruit punch, how many liters of each type of juice does she need to use? Additionally, if she has 5 liters of orange juice already, how much more orange juice does she need to buy? Let's think step by step and output the final answer within \boxed{}.
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