Răspuns:
a+b+c=1425
a:b=3=>a=3b
c:a=2 rest 125=>c=2a+125=>c=6b+125
3b+b+6b+125=1425
10b=1425-125=>b=1300:10=>b=130
a=3·130=390
c=6·130+125=905
_________________
a+b+c=21
b+c=15
8+7=15=>a=6
9+6=15=>a=6 nu convine a≠b≠c
a+b=13
6+b=13=>b=13-6=>b=7
c=8
nr cautat este 678
