a+b+c=61
c=18+2 x a =>a=(c-18):2
c=25+b => b=c-25
Inlocuim pe a si b in prima relatie si obtinem:
(c-18):2+c-25+c=61 /+25
(c-18):2+2 x c=86 /x2
c-18+4 x c=172 /+18
5 x c=190 /:5
c=38 => a=(38-18):2=20:2=10 si b=38-25=13
Raspuns:
In prima zi (a) a livrat 10 tone
In a doua zi (b) a livrat 13 tone
In a treia zi (c) a livrat 38 tone