[tex] \frac{a+b+c}{3} [/tex]= 25 => a+b+c= 75
[tex] \frac{a+b}{2} [/tex]=25 => a+b=50
a=[tex] \frac{b}{4} [/tex]
înlocuim a cu [tex] \frac{b}{4} [/tex]
[tex] \frac{b}{4} [/tex] + [tex] ^{4)} b[/tex]b = 50
[tex] \frac{b}{4} + \frac{4b}{4} [/tex] = 50
5b supra 4=50 => 5b= 200=> b=40
a = b supra 4 => a= 10
10+40+c=75
c=25
