Răspuns:
755
Explicație pas cu pas:
[tex]\left \{ {{23a+77b=51330} \atop {77a+23b=24170}} \right. \left \{ {{23a+23b+54b=51330} \atop {23a+23b+54a=24170}} \right. \\Adunam\\2*(23a+23b)+54a+54b=51330+24170\\2*23*(a+b)+54*(a+b)=75500\\46(a+b)+54(a+b)=75500\\100(a+b)=75500\\a+b=75500:100\\a+b=755[/tex]