Why would negative numbers not make sense for the values of variables

The letter tiles shown below are in a bag. whiteout looking i am going to draw one tile. what are my chances of drawing g?

Sandy is ordering bread rolls for her party,she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels