Question

Media aritmetica a trei nr nat este 20.Aflati nr stiind ca primele doua au media aritmetica 19,iar ultimele doua au media aritmetica 21

Answer 1

(a+b+c)/3=20; a+b+c=60
a+b=38
b+c=42
c=60-(b+c)=60-38=22
b=42-22=20
a=38-20=18