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Dana si Ina au impreuna 50 timbre.Daca Dana isi injumatateste numarul, iar Ina si-l dubleaza, atunci fetele au acelasi nr. de timbre.
Afla cate timbre are fiecare.


Răspuns :

d+i =50

d/2 = 2i

d= 4i

4i+i=50

5i=50

i=50:5

i=10 timbre are Ina

d=4*10=40 timbre are Dana