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To determine the constant of proportionality, we need to compare the amounts of raspberry and lemonade in the ratios.
From the table, we can see that for every 2.5 units of raspberry, we need 5 units of lemonade (2.5:5). This ratio simplifies to 1:2.
Therefore, the constant of proportionality appears as 1:2, which means for every 1 scoop of raspberry, Rosie needs to add 2 cups of lemonade.