Question

In trei cisterne sunt 7890 l ulei. Sa se afle cati litri de ulei sunt in fiecare cisterna, stiind ca in primele doua sunt 4253l , iar in ultimele doua 6099 l. Dau coroana!!!

Answer 1

a+b+c=7890 l ulei in cele trei cisterne
a+b=4253 l
b+c=6099 l
4253+c=7890
c=7890-4253
c=3637 l  ulei in a treia cisterna
a+6099=7890
a=7890-6099
a=1791 l ulei in prima cisterna
1791+b=4253
b=4253-1791
b=2462 l ulei in a doua cisterna
V: 1791+2462+3637=7890 l

Answer 2

a+b+c=7890
a+b=4253
b+c=6099
4253 +c=7890 c=7890 -4253 =3637 l
6099 +a=7890 a=7890 -6099 =1791 l
1791 +b+3637 =7890 b=7890 -3637 -1791
b=2462 l
1791 +2462 +3637 =7890