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(16% * 300 *100 %) : (300 + x) = 15%
(0,16 * 300 *100) : (300 + x) = 15
4800 : (300 + x) =15
4800 = 15 * (300 + x)
4800= 4500 + 15x
-15x = 4500- 4800
-15x = -300 || : 15
x= 20
odp. należy dolać 20 kg wody