Question

Suma a doua numere este 110 , iar diferenta 30
Aflati numerele

Answer 1

a+b=110
a-b=30
a=30+b
30+b+b=110
30+2b=110
2b=110-30
2b=80
b=80:2=40
a=30+b=30+40=70
70+40=110(verificare)

Answer 2

$a+b=110 \\ a-b=30 \to \boxed{a=30+b} \\ ****************\\ 30+b+b=110 \\ 30+2b=110 \\ 2b=110-30 \\ 2b=80 / :2 \\ \boxed{b=40} \\ \\ a-40=3 \\ \boxed{a=70}$