m(розчину)=300+400=700г
m(речовини)=(300*25/100)+(400*40/100)=235г
w=235*100/700=33,571%
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m(розчину)=300+400=700г
m(речовини)=(300*25/100)+(400*40/100)=235г
w=235*100/700=33,571%