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Burek-3x 3*1kg=3kg
3x+x=4
4x=4/:4
x= 1kg
4*1kg=4kg -> As
4*3kg=12kg -> Burek
12kg-4kg=8kg
Odp: Burek niż As zjada w ciągu 4 tygodni o 8kg karmy więcej niż As.