Zmieszano 200g roztworu 7% z 300g roztworu 15%. Oblicz stężenie procentowe mieszaniny.
200g·7%=14g
300g·15%=45g
14g+45g=59g
200g+300g=500g
59g:500g=0,118=11,8%
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200g·7%=14g
300g·15%=45g
14g+45g=59g
200g+300g=500g
59g:500g=0,118=11,8%