Răspuns :
[tex] \frac{60}{100} x=18 \\ \\ 60x=18*100 \\ \\ x=1800:60 \\ \\ x=30[/tex]
60/100 *x =18
60x=1800
x=1800:60
x=30
Verificare : 60/100 *30 =(60*30):100=1800:100=18
60x=1800
x=1800:60
x=30
Verificare : 60/100 *30 =(60*30):100=1800:100=18