Răspuns :
b=6a
2a + 3b = 1.220
2a + 3 × 6a = 1.220
2a + 18 a = 1.220
20a = 1.220
a = 1.220 : 20 = 61
b = 6 × 61 = 366
2a + 3b = 1.220
2a + 3 × 6a = 1.220
2a + 18 a = 1.220
20a = 1.220
a = 1.220 : 20 = 61
b = 6 × 61 = 366