Răspuns :
40% este 40/100=4/10=2/5
2x/5 + 90 = x
2x+450=5x
450=3x
x=150 ha
2x/5 + 90 = x
2x+450=5x
450=3x
x=150 ha
40x/100 =2x/5
2x/5 +90 =x numitor 5
2x+450 =5x
5x-2x =450
3x=450
x=150 ha
2x/5 +90 =x numitor 5
2x+450 =5x
5x-2x =450
3x=450
x=150 ha