1) C=200-110= 90
A=200-190=10
A+B=110 => B=110-A=110-10=100
2) Afla fiecare numar
a+b+c+d=1050
d=a+50
c=d+70 = a+50+70
b=d+30 = a+50+30
(inlocuim b,c,d cu rezultatele)
a+a+50+30+a+50+70+a+50=1050
4a+250=1050
4a=800
a=200
d=a+50=200+50=250
c=d+70=250+70=320
b=d+30=250+30=280