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y - ilość roztworu 5%
0,1x + 0,05y = 1000 * 0,06
x + y = 1000
0,1x + 0,05y = 60|*(-10)
x + y = 1000
-x - 0,05y = -600
x + y = 1000
-0,5y + y = -600 + 1000
x + y = 1000
y = 800
x + 800 = 1000
y = 800
x = 200
pozdrawiam!!