Question

Media aritmetica a 6 numere este 70.Calculati media aritmetica a 3 dintre acestea, stiind ca media aritmetica a celorlalte 3 este 60

Answer 1

(a+b+c+d+e+f)/6=70
a+b+c+d+e+f=420
a+b+c=60*3=180⇒d+e+f=420-180=240⇒(d+e+f)/3=240/3⇒(d+e+f)/3=80

Answer 2

a+b+c+d+e+f supra 6=70
a+b+csupra 3 =60
a+b+c=60*3=180
  
180+c+d+f supra 6=70
180+c+d+f=70*6
180+c+d+f=420
c+d+f=420-180
c+d+f=240