Question

trei nr naturale au suma 80. media aritmetica a primelor doua este 12 iar media aritmetica a ultimelor 2 este 36. aflati nr

Answer 1

(a+b):2=12=>a+b=6=>a=6-b
(b+c):2=36=>b+c=18=>c=18-b
a+b+c=80 inlocuiesti
6-b+b+18-b=80
24-b=80=>-b=-57
a=6-b
a=6-(-57)
a=6+57
a=63
c=18-b
c=18+57
c=75