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3/5=60/100=60%
2/5=40/100=40%
Zawartość procentowa magnezu w tlenku magnezu to 60%.
Natomiast zawartość procentowa tlenu w tlenku magnezu to 40%.
3- magnez
2- tlen
3+2= 5
Magnez
5 - 100%
3 - x%
I teraz 3x100:5=60
x=60%
Magnez wynosi 60%
Tlen
5 - 100%
2 - x%
I teraz 2x100:5=40
x=40%
Tlen wynosi 40%