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x= cyfra dziesiatek
y=cyfra jednosci
x=y+1
10x+y=6(x+y)
10x+y=6x+6y
10x-6x=6y-y
4x=5y
4(y+1)=5y
4y+4=5y
4=5y-4y
y=4 x=4+1=5
to liczba 54
2]
x=ilośc solanki 5%
y=ilosc solanki 8%
x+y=7
5%x+8%y=7*7% /;%
y=7-x
5x+8(7-x)=49
5x+56-8x=49
56-49=3x
x=7/3 kg=2 i 1/3 kg
y=7-2 i 1/3=4 i 2/3 kg
potrzeba 2 i 1/3 kg solanki 5% i 4 i 2/3 kg solanki 8%