Emma is planning a party and wants to serve fruit punch. She needs 3 gallons of fruit punch in total. She already has 1 1/2 gallons of fruit punch. To make the remaining fruit punch, she will use a mix that requires 2 parts water for every 1 part concentrate. How much concentrate and how much water does Emma need to make the remaining fruit punch? Let's think step by step and output the final answer within \boxed{}.
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