10% * x = 85% * 0,5
0,1x = 0,85 * 0,5
0,1 x = 0,425 /*10
x = 4,25 kg --------- odpowiedź
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10% * x = 85% * 0,5
0,1x = 0,85 * 0,5
0,1 x = 0,425 /*10
x = 4,25 kg --------- odpowiedź