Răspuns :
notam partile cu x si y.
x × 4 = y × 5 => x= 5y : 4 =>
y+ 5y:4 = 36 <=>
9y:4=36 <=>
9y= 144
y= 16 => x= 20
x × 4 = y × 5 => x= 5y : 4 =>
y+ 5y:4 = 36 <=>
9y:4=36 <=>
9y= 144
y= 16 => x= 20
p+q=36;
{p,q}ip{4,5};
4p=5q=k;
p=k/4;
q=k/5;
k/4+k/5=36;
9k=720;
k=80;
p=20;
q=16