Răspuns :
L/l=25/10=5/2⇒L=5l/2
P=2(L+l)
40=2(L+l)⇒L+l=20⇒5l/2+l=20⇒5l/2+2l/2=20⇒7l/2=20⇒l=40/7
L=5/2*40/7=100/7
P=2(L+l)
40=2(L+l)⇒L+l=20⇒5l/2+l=20⇒5l/2+2l/2=20⇒7l/2=20⇒l=40/7
L=5/2*40/7=100/7