Question

x-y supra y= 3 supra 4. Aflati valoarea raportului dintre x supra y

Answer 1

$\dfrac{x-y}{y}= \dfrac{3}{4}=\ \textgreater$
4x-4y=3y
4x=3y+4y
4x=7y
$\dfrac{x}{y}= \dfrac{7}{4}$
x/5=y/3=z/7=k=>x=5k'y=3k'z=7k
5k+2*3k-7k=192
4k=192
k=48=>x=240;y=144;z=336
:D