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10kg = 2/3 calej ilosci mleka
5 kg = 1/3 calej ilosci mleka
10kg + 5kg = 15kg
17kg - 15kg = 2kg
Pusty pojemnik wazy 2kg.
x-waga pojemnika
y-waga mleka
x+1/3y=7
x+y=17
x=17-y
17-y+1/3y=7
17-7=3/3y-1/3y
10=2/3y /*3
2y=30 /:2
y=15
x=17-15
x=2
Odp:2kg