Conform enunt avem: a+b+c=90000;
a=b/2 ; c=3/2*b.
Se inlocuiesc a si c in prima ecuatie si obtinem valoarea lui b:
b/2+b+3/2*b=90000. Se aduce la acelasi numitor=>
b+2b+3b=180000 => 6b=18000 =>
b=180000/6 => b= 30000.
a=30000/2; => a=15000;
c=3/2*b= 3/2*30000 => c=45000;