Răspuns :
a + b +c = 111 si
a = (b+c)/2 inseamna ca b+c=2a
↓
a + 2a = 111
↓
a = 111:3 = 37
↓
b + c = 2×37 = 74
a = (b+c)/2 inseamna ca b+c=2a
↓
a + 2a = 111
↓
a = 111:3 = 37
↓
b + c = 2×37 = 74
a+b+c=111
a=b+c/2
b+c/2+b+c=111
b+c+2b+2c=222
3b+3c=222
b+c=222/6
b+c=37
a=b+c/2
b+c/2+b+c=111
b+c+2b+2c=222
3b+3c=222
b+c=222/6
b+c=37