Question

Calculati media aritmetica a trei numere , stiind ca doua cate doua au media aritmetica: 11,36 si 32.

Answer 1

(a+b+c):3=?
(a+b):2=11
a+b=22
(b+c):2=36
b+c=72
(c+a):2=32
c+a=64
a+b+b+c+c+a=22+72+64
2a+2b+2c=158
2*(a+b+c)=158
a+b+c=79
22+c=79
c=57
b+64=79
b=15
a+72=79
a=6
(6+15+57):3=
78:3=26