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................ x%
80g 20% .............. x-5
30/80 = 20-x/x-5
30(x-5) = 80(20-x)
30x-150 = 1600-80x
110x = 1750
x = 15,91%
ms=mr*cp/100%
mr1=30g
cp1=55%
ms=30*5/100%=1,5g
mr2=80g
cp2=20%
ms=80*20/100%=16g
mr=110g
ms=1,5+16=17,5g
cp=?
cp=17,5/110*100%=15,90%