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y+0,5x=17,5
x=33-y
y+0,5(33-y)=17,5
16,5+0,5y=17,5
0,5y=1
y=2
beczka waży 2 kg
Y-waga zawartości
x+y=33
x+1/2y=17,5kg
1/2y= 33-17,5
1/2y=15,5
x=17,5 - 15,5
x=2kg