one half = [tex]\dfrac{1}{2}[/tex]
If Mrs. Marina is going to make one half of the recipe, then she needs
[tex]\dfrac{5}{6} :2=\dfrac{5}{6}*\dfrac{1}{2} =\dfrac{5}{12}[/tex]
Answer: Mrs. Marina needs [tex]\dfrac{5}{12}[/tex] of sugar to make one half of recipe.