primul copil=x+80
al doilea copil=x
x+80-60=[tex] \frac{3}{4} * (x+60)[/tex]
x+20=[tex] \frac{3}{4} x+ \frac{3}{4}*60 [/tex]
x-[tex] \frac{3}{4} x [/tex]=45-20
(se aduce la acelasi numitor)=>[tex] \frac{1}{4} x=25[/tex]=>x=25*4=>x=100=>al doilea copil are 100 lei, iar primul are 180 lei