Question

Mara,Vlad si Miruna au colectionat,520,de timbre.Daca Vlad a colectionat de 2 ori mai multe timbre decit Mara si cu440mai putine ca Miruna,afla cite timbre a colectionat fiecare

Answer 1

notam

Mara = a

Vlad = b

Miruna = c

a +b+c=520

b = 2 x a

b = c-440⇒c = b+440

a + 2xa + b +440 = 520

a + 2a +2a+440=520

5a = 520-440

5a = 80

a = 80/5

a = 16 timbre are Mara

b= 2 x a

b= 2 x 16= 32

Vlad are 32 timbre

b = c-440

c= 440+32=472 timbre

c= 472 timbre are Miruna

16 + 32 + 472 = 520 verificare