20% × 200g = 40g
40% × 400g = 160g
400g + 200g = 600g
160g ÷ 600g ≈ 27%
Odp.: Stężenie wynosi około 27%
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20% × 200g = 40g
40% × 400g = 160g
400g + 200g = 600g
160g ÷ 600g ≈ 27%
Odp.: Stężenie wynosi około 27%