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z-solanka 70%
0,3x+0,7z=0,4*200
3x+7z=800
x+z=200 |*(-3)
3x+7z=800
-3x-3z=-600
4z=200
z=50
Trzba wziąść 50 kg solanki 70% i 150 kg solanki 30%
y-70% ==
x+y=200
0,7x+0,3y=200razy 0,4 /razy 100
x+y=200 /razy -30
70x+30y=8000
-30x-30y=-6000
70x+30y=8000
40x=2000
x=50
x=50g
y=150g