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mr-400g
C%-5%
ms=5/100×400
ms=20g
mr-500g
ms-20g
C%=20×100÷500
C%=4%
stężenie % wynosi 4%
2.
mr-300g
C%-10%
ms=0.1×300
ms=30g
mr-200g
ms-30g
C%=30×100÷200
C%=15%
Stężenie % wynosi 15%