Răspuns :
Notez cu a și b-nr.
a+b=70
{a, b} d.p {2, 5}
a/2=b/5=>a=2b/5
2b/5+b=70
2b+5b=70*5
7b=70*5
b=70*5/7=50=>a=2*50/5=20
a+b=70
{a, b} d.p {2, 5}
a/2=b/5=>a=2b/5
2b/5+b=70
2b+5b=70*5
7b=70*5
b=70*5/7=50=>a=2*50/5=20
a/2 =b/5
a/2+b/5 =a+b/2+5 =70/7 =10
a/2 =10 ;a =2*10 =20
b/5 =10 ; b =5*10 =50
a/2+b/5 =a+b/2+5 =70/7 =10
a/2 =10 ;a =2*10 =20
b/5 =10 ; b =5*10 =50