Răspuns :
a + b = 748
a : b = 3 => a = 3b
_____________
3b + b = 748
4b = 748
b = 748 : 4
b = 187
a = 187 × 3
a = 561
a : b = 3 => a = 3b
_____________
3b + b = 748
4b = 748
b = 748 : 4
b = 187
a = 187 × 3
a = 561