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2y = x+5
-1,5y= -x
2y = x+5
0,5y = 5 kg
1y (lis) = 10 kg
3 * 10 = 2x
30 = 2x
x=15 kg (borsuk)
odp. Borsuk waży 15 kg.
l - waga lisa
2b = 3l /:2
2l = b+5
b = 1½l
2l = b+5
b = 1½ l
2l = 1½l+5
b = 1½l
2l-1½l = 5
b = 1½l
½l = 5 /*2
b = 1½l
l = 10
b = 1½*10
l = 10
b = 15
l = 10
Borsuk waży 15 kilogramów.