a+b+c=77
b=[tex] \frac{a}{2} [/tex]
c=[tex]a* \frac{1}{3} = \frac{a}{3} [/tex]
a+[tex] \frac{a}{2} [/tex]+[tex] \frac{a}{3} [/tex]=77 Aducem la acelasi numitor!(6)
[tex] \frac{6a+3a+2a}{6}= \frac{462}{6} /*6[/tex]
11a=462==>a=[tex] \frac{462}{11} [/tex]=42
b=[tex] \frac{a}{2} = \frac{42}{2} =21[/tex]
c[tex] \frac{a}{3} = \frac{42}{3} =14[/tex]