Question

Media aritmetica a 3 nr care sint direct proportionale cu 5,6,7 , daca suma celor doua nr mai mici este 55

Answer 1

a/5=b/6=c/7
a/5+b/6=55/11=5
5/1=a/5=b/6=c/7
a=5*5=25
b=25*6:5=30
c=30*7:6=35
(a+b+c):3=(25+30+35):3=90:3=30