Răspuns:
Explicație pas cu pas:
a : b = 3 => a = 3 × b
c : a = 2 ⇒ c = 2 × a = 2 × 3 × b => c = 6 × b
__________________
c - b = 45
6 × b - b = 45
5 × b = 45 ⇒ b = 9
_____________________
a = 3 × b = 3 × 9 ⇒ a = 27
c = 2 × a = 2 × 27 ⇒ c = 54
________________________
2 b + a + 3 c = 207
= 2 × 9 + 27 + 3 × 54 =
= 18 + 27 + 162 =
= 27 + 180 =
= 207
