Your thoughts are correct; Ned loses 14 points overall.
The reason the correctly answered questions do not factor into the answer is because that is not what the question is asking. Correct answers are not even mentioned :)
X+y+z≥627
x=222
y=194
222+194+z≥627
if we solved for z then
z≥221
The answer is B because if you add the to angles together you create a straight line.