Răspuns :
la proportii produsul mezilor=produsul extremilor => 4x=6y si x+y=60
x=60-y => 4(60-y)=6y
240-4y=6y
10y=240 => y=24 si x=36
x=60-y => 4(60-y)=6y
240-4y=6y
10y=240 => y=24 si x=36
x/6=y/4=k x=6k b=4k a+b=60 inlocuim si avem; 6k+4k=60 10k=60 =>k=6 x=6*6 =>x=36 b=4k b=4*6 =>b=24 facem proba 36+24=60