Question

Suma a doua numere este 28,77 . Calculati numerele stiind ca diferenta lor este 5,69 ! 

Answer 1

$a+b=28,77 \\ a-b=5,69 \to \boxed{a=5,69+b} \\\\ 5,69+b+b=28,77 \\ 5,69+2b=28,77 \\ 2b=28,77-5,69 \\ 2b=23,08 \\ b=23,08:2 \\ \boxed{\boxed{b=11,54}} \\\\ a+11,54=28,77 \\ \boxed{\boxed{a=17.23}}$