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96%y + 61%x = 75% * 250
x+y = 250 / * (-96)
0.96y + 0.61x = 187.5 / * 100
-96y - 96x = -24000
96y + 61x = 18750 +
__________________
-35x = - 5250 /: (-35)
x = 150
x = 150
x + y = 250
x = 150
y = 100
Odp; Należy wziąć 150kg ługu 61% i 100kg ługu 96%
Mam nadzieję, że pomogłam ;))