Răspuns :
(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
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
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
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