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1%×200g/200g-x=4%
2g/200g-x=4/100
200g=4×(200g-x)
200g=800g-4x
-4x=-600g/:(-4)
x=150g-ilość wody jaką należy odparować;
Zad2) 5%×150g/150g+50g=7,5g/200g≈0,04=4%