The second present needs 3 / 4 * 2 = 1 1/2 square feet of wrapping paper.
The third present needs 2 + 1 1/2 = 3 1/2 square feet of wrapping paper.
Therefore, Carrie needs 2 + 1 1/2 + 3 1/2 = 7 square feet of wrapping paper for all three presents.
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