Question

Dan,Razvan si George au in total 123 de timbre.Cate timbre are fiecare,stiind ca Dan are de 2 ori mai multe decat Razvan si cu 28 mai putine decat George?

Answer 1

Răspuns:

Explicație pas cu pas:

Metoda grafica

Dan         l-------l-------l

Razvan    l-------l                      }  total = 123 timbre

George    l-------l-------l + 28

123 - 28 = 95 → suma celor 5 segmente ( parti ) egale

95 : 5 = 19 timbre are Razvan

2 × 19 = 38 timbre are Dan

38 + 28 = 66 timbre are George

_________________________

Verific:   38 + 19 + 66 = 123 timbre au cei trei copii

Answer 2

D + R + G = 123

D = 2 × R

D = G - 28

G = 28 + D

G = 28 + 2 × R

2 × R + R + 28 + 2 × R = 123

5 × R + 28 = 123

5 × R = 123 - 28

5 × R = 95

R = 95 : 5

R = 19

D = 2 × 19

D = 38

G = 28 + 38

G = 66