a : b = 3 ⇒ a = 3 × b
c : a = 2 ⇒ c = 2 × a = 2 × 3 × b = 6 × b
c - b = 45 ⇒ c = b + 45
Egalam relatiile:
c = 6 × b = b + 45
5 b = 45
b = 45 : 5
b = 9
a = 3 × 9
a = 27
c = 9 + 45
c = 54
2 b + a + 3 c = 2 × 9 + 27 + 3 × 54 = 18 + 27 + 162 = 180 +27 = 207
