Ted is making a bread recipe that uses 31/4 cups of flour and a muffin recipe that uses 23/4 cups of flour. how much more flour is in the bread than in the muffins? how much flour does ted need for both recipes?

To get the difference between recipes we have to subtract 31/4 - 23/4. When we are subtracting fraction we have to have common denominator - its ok here. Now subtraction will be easy, only subtract numerator, denominator will not change.
- its the result, so in bead recipe is 2 cups more than in muffin.

To get total cups required to cook bread and muffin we have to add 31/4 and 23/4. Its very similar to subtraction.
- the result is 13.5 cups.

C is The answer because x=5 you plug it into the equation making it the first step to solving it          :)