Answer:
[tex]\frac{1}{2}[/tex] of a cup of mix.
Step-by-step explanation:
Thor measured out [tex]\frac{2}{6}[/tex] of a cup of mix.
The recipe calls for a total of [tex]\frac{5}{6}[/tex] of a cup of mix.
To find the number of cups needed to be added to what Thor measured;
We subtract [tex]\frac{2}{6}[/tex] from [tex]\frac{5}{6}[/tex] to get;
[tex]\frac{5}{6} - \frac{2}{6} = \frac{3}{6} = \frac{1}{2}[/tex] of a cup of mix.