u+p+r=63
4u+2(p+r)=132
r=4p, inlocuim pe r in a doua ecuatie
4u+2(p+4p)=132, 4u+2x5p=132, 4u+10p=132, 4u=132-10p, u=(132-10p)/4
(132-10p)/4+p+4p=63, numitor comun 4
132-10p+4p+16p=252
10p=252-132=120, p=120/10=12 pauni
r=4p=12x4=48rate
u=63-p-r=63-12-48=63-60=3ursi