Question

Suma a doua numere este 80 , iar diferenta este 20 . Aflati numerele !!!

Answer 1

$a+b=80\\a-b=20 \to \fbox{a=20+b} \\ ***************\\\\20+b+b=80\\20+2b=80\\2b=80-20\\2b=60\\b=60:2\\\boxed{b=30}\\ \\ a+30=80\\a=80-30\\\boxed{a=50}$