3 3/4cups,
2 1/2 cups of cranberry juice = 4 cups of club soda so we know that we would have to add 2 more cups of club soda which is equal to 1 1/4 of cranberry juice
4 = 2 1/2 and 2 = 1 1/4
2 1/2 + 1 1/4 = 3 3/4 cups
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