Răspuns :
[tex] \frac{18}{100} \times x = 90[/tex]
[tex] \frac{18x}{100} = 90[/tex]
[tex]18x = 9000[/tex]
[tex]x = \frac{9000}{18} [/tex]
[tex]x = \frac{3000}{6} [/tex]
[tex]x = 500[/tex]
[tex] \frac{18x}{100} = 90[/tex]
[tex]18x = 9000[/tex]
[tex]x = \frac{9000}{18} [/tex]
[tex]x = \frac{3000}{6} [/tex]
[tex]x = 500[/tex]