Răspuns:
radio=
[tex] \frac{3x}{7} [/tex]
rest=
[tex]x - \frac{3x}{7} = \frac{7x - 3x}{7} = \frac{4x}{7} [/tex]
tablou=
[tex] \frac{3}{8} \frac{4x}{7} = \frac{3x}{14} [/tex]
total suma
[tex] \frac{3x}{7} + \frac{4x}{14} + 75 + 25 = x[/tex]
[tex] \frac{6x + 4x + 1400}{14} = x[/tex]
[tex]10x + 1400 = 14x[/tex]
[tex]14x - 10x = 1400[/tex]
[tex]4x = 1400[/tex]
[tex]x = 350[/tex]
