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y-ilość stopu 400
x+y=200
0,96x + 0,4y = 0,75 * 200
x=200-y
0,96(200-y) + 0,4y=150
x=200-y
192 - 0,96y + 0,4y = 150
x=200-y
192 - 0,56y = 150
x=200-y
0,56y = 42
y=75
x=125
Odp.: Należy wziąć 125g stopu próby 960 i 75g stopu próby 400.