х, у - слагаемые[latex] left { {{x+y=56,} atop {frac{x}{3}=frac{y}{4};}} ight. left { {{x+y=56,} atop {y=frac{4x}{3};}} ight. \ x+frac{4x}{3}=56, \ 3x+4x=56cdot3, \ 7x=56cdot3, \ x=8cdot3, \ x=24; \ y=frac{4cdot24}{3}=4cdot8=32.[/latex]