Răspuns: [tex]\green{\bf x=550~lei\longrightarrow Varianta ~b)}[/tex]
Explicație pas cu pas:
Notam cu x suma de bani ce o avea initial
[tex]\bf x - 220~ lei = 60\%\cdot x[/tex]
[tex]\bf x - 220~ lei = 60:100\cdot x~~~\bigg|\cdot 100[/tex]
[tex]\bf 100x - 22000~ lei = 60x[/tex]
[tex]\bf 100x = 60x+22000~lei[/tex]
[tex]\bf 100x - 60x=22000~lei[/tex]
[tex]\bf 40x=22000~lei~~~\bigg|:40[/tex]
[tex]\red{\boxed{\bf x=550~lei\longrightarrow Varianta ~b)}}[/tex]
#copaceibrainly
