a+b+c+d+e = 30 (i) c+e = 14 (ii) d+b = 1 (iii) a = 2b-1 (iv) a+c = 10 (v) By (i)-(ii)-(iii): a = 15 then, by (iv): b = 8 and by (v): c = -5 Also, b = 8 so by (iii): d = -7 and then by (i), e = 19

Let A = 4 Let B = 3 Let C = 2 Class Score = A + B + (C * 3) Class Score = 4 + 3 + 6 Class Score = 13 Number of classes = 5 GPA = Class Score / Number of classes GPA = 13 / 5 GPA = 2.6 Your school may use a different scale for each class, but this formula will work, just find out what A/B/C/D…