Question

daca la suma a doua nr adunam diferenta lor si obtinem 60 iar daca din suma scadem diferenta , obtinem 40.care sunt nr?

Answer 1

(a+b)+(a-b) = 60
2×a = 60
a = 60:2
a = 30
(a+b)-(a-b) = 40
a+b-a+b = 40
2×b = 40
b = 40:2
b = 20

Verificare:
(30+20) +(30-20) = 50+10 = 60
50-10 = 40

Raspuns:
a = 30
b = 20