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x - masło
0,77x+0,82y=0,8*(x + y) /*100
x+y=250
77x+82y=80*(x + y)
x=250-y
77x+82y=80x+80y
x=250-y
77x-80x+82y-80y=0
x+y=250
-3x+2y=0
x=250-y
-3(250-y)+2y=0
x=250-y
-750+3y+2y=0
x=250-y
x = 250-y
5y = 750
y =750/5=150
x=250-y
x=250-150=100