Răspuns :
[tex]\frac{20}{100}*x=25 \\ \\ \frac{20x}{100} =25 \\ \\ x= \frac{ 100*25}{20} \\ \\ x=5*25 \\ \\ x=125[/tex]
verificare
125×20%=25
125×20/100=2500/100
25=25
verificare
125×20%=25
125×20/100=2500/100
25=25