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{1/10a + 1/25b = 0,9kg /*10
{a + b = 15kg
{a + 10/25b = 9kg
{a + b = 15kg
10/25b - b = 9kg - 15kg
-15/25b = -6kg
b = 10 kg
a = 15kg - b
a = 5kg
Odp. Należy wziąć 10kg solanki 4% i 5kg solanki 10%.