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Matei si mirel au 16 timbre impreuna. Matei are cu 4mai putine decat Mirel. Cate timbre are fiecare baiat?

Răspuns :

a- Matei
b- Mirel

a+b=16 => a=16-b
a= b-4

16-b=b-4
16+4=b+b
20=2b
b=10 timbre

a=10-4=6 timbre

VERIFICARE: 6+10= 16 (A)

(16-4):2=12:2=6 timbre are Matei

6+4=10 timbre are Mirel