Răspuns :
a + 3 = 18 a = 18 -3 a= 15
2 xb = 18 b = 18 : 2 b = 9
c x 3 = 18 c = 18 : 3 c = 6
a + b + c = 15 + 9 + 6 = 30
2 xb = 18 b = 18 : 2 b = 9
c x 3 = 18 c = 18 : 3 c = 6
a + b + c = 15 + 9 + 6 = 30