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The equation 2s = 3 1/2 means that the amount of sugar (s) is equal to 3 1/2 divided by 2.
So, to fill in the blank, we need to find 3 1/2 divided by 2:
3 1/2 = 7/2
(7/2) / 2 = 7/4
Therefore, the recipe requires 7/4 (or 1 3/4) the amount of sugar than flour.