Răspuns :
Fie a lazile de 10 si b lazile de 20
a+b = 130 / x 10
10a+10b=1300 -
10a+20b=1770
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10b = 470
b = 47 lazi de 20 kg
a = 83 lazi de 10 kg
a+b = 130 / x 10
10a+10b=1300 -
10a+20b=1770
-----------------------
10b = 470
b = 47 lazi de 20 kg
a = 83 lazi de 10 kg
X+y=130 10x+20y=1770 -10x-10y=-1300 10y=470 y=47 x=130-47 x=83