Really Zegroes! If you are not going to answer properly (with explanation) then you shouldn't answer at all. 
I am looking at them as ratios. You donot need to convert anything because
all the sugar is measured in tablespoons and all the tea is measured in ounces. 
Kim => 3:6 => 1:2
Nick=> 6:30 => 1:5
Alissa => 2:5
You can think of these ratios like fractions.
1/5 and 2/5 are both less than a half so
1:2 => Kim's tea is sweetest
♬