Question

Doua numere au media aritmetica 18 si raportul 5. Aflati numerele

Answer 1

(a+b):2=18 / *2
a+b=36
a : b =5 =>a=5b ducem a in a din suma
5b+b=36
6b=36 / :6
b=6
a+6=36=> a=36-6 =>a=30
cu placere !

Answer 2

(a+b)/2 = 18 => a+b=36 => a=36-b
a/b=5 => (36-b)/b =5 => 36-b = 5b => 36 = 6b => b=36 => a=30