Question

Denisa are de cinci ori mai multe timbre decat Alina.Daca Denisa i-ar da Alinei 60 de timbre atunci ar avea acelasi numar de timbre.Cate timbre are fiecare?

Answer 1

d=5a
d-60=a+60=>d=a+120
a+120=5a=>120=5a-a=>a=120:4=>a=30 timbre Alina
d=5x30=150 timbre Denisa

Answer 2

d = 5a
d - 60 = a + 60 => d = a + 120, echivalam
5a = a + 120
5a - a = 120
4a = 120
a = 120 : 4
a = 30 timbre ALINA
d = 30 x 5 = 150 timbre DENISA