Răspuns :
A/3=B/4=C/11= (A+B+C)/(3+4+11) =180/18=10
A/3=10 =>A=30 grade
B/4=10 =>B=40 grade
C/11=10 =>C=110 grade
A/3=10 =>A=30 grade
B/4=10 =>B=40 grade
C/11=10 =>C=110 grade