Răspuns:
Aici ai rezolvarea! Sper că te-am ajutat
x/y=3/5=>5x=3y
y-x=20 I·3
3y-3x=60=>5x-3x=60=>2x=60=>x=60:2=>x=30
x/(y-x)=30/20=3/2
___________
5x/2y=2/5=>5·5x=2·2y=>25x=4y I:2=>5x=2y
5x+2y=56=>2y+2y=56=>4y=56=>y=56:4=>y=14
(5x+2y)/2y=56/(2·14)=56/28=2
