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y- ilość masła
x+y=250
0,77y+0,82x=0,8×250/100
x+y=250
77y+82x=82x250
y=250-x
77y+82x=20000
y=250-x
77(250-x)+82x=20000
y=250-x
19250-77x+82x=20000
y=250-x
5x=750/5
y=250-x
x=150
y=250-150
x=150
y=100
x=150
x=150
y=100