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10% * 12l = 6% * (12l + x)
0,1 * 12l = 0,06 * 12l + 0,06x
x = 8l
12 + x = 12 + x
10% 0% 6%
12 · 10 + 0 · x = (12 + x) · 6
120 = 72 + 6x
120 - 72 = 6x
6x = 48
x = 8 [l]
Należy dolać 8 litrów wody