Răspuns :
x- numar
30x/100=x/5+1.42
3x/10=x/5+1.42. Aducem la ac numitor
3x=2x+14.2
3x-2x=14.2
x=14.2
30x/100=x/5+1.42
3x/10=x/5+1.42. Aducem la ac numitor
3x=2x+14.2
3x-2x=14.2
x=14.2