Answer:
2 cups of sugar
Explanation:
Trina uses the number of cups of sugar in a recipe =
= 0.5 cups
she uses the number of cups of flour in a recipe =
= 0.75 cups
The proportion of sugar and flour she uses =

Let the sugar would be needed for 3 cups of flour = x
Therefore,
×


x = 2
She would be needed 2 cups of sugar.