Răspuns :
a+b=150
a+a+b=9xb
2a+b=9b
9b=2a+b
8b=2a|:2
a=4b
4b+b=150
5b=150
b=30
a+30=150
a=120
Verificare:120+150=30x9
270=270
a+a+b=9xb
2a+b=9b
9b=2a+b
8b=2a|:2
a=4b
4b+b=150
5b=150
b=30
a+30=150
a=120
Verificare:120+150=30x9
270=270
a+b+c=150 150+9+159...............................................................................................................................................................