Question

andra primeste cadou o cutie de bomboane .ea mananca in prima zi jumatate din nr bomboanelor ,a doua Zi o treime din cea Mai ramas ,iar a treia Zi jumatate din noul rest .daca acum se gasesc in cutie 5 bomboane ,Cate bomboane au fost la inceput?

Answer 1

Metoda grafică:

I zi |××××××|---------|
II zi...............|××|---|---| (din rest)
III zi....................|××|--| (din rest)
..................................5..................................

=> |--|=5 bomboane
5×2=10 bomboane (III zi+rest)
10:2=5 bomboane (un segment II zi+III zi)
5×3=15 bomboane (II zi+III zi+rest)
15×2=30 bomboane (total)

Answer 2

     REZOLVARE:

1.5×2=10 bomboane (III zi)
2.10:2=5 bomboane (II zi si III zi)
3.5×3=15 bomboane (II zi III zi si rest)
4.15×2=30 bomboane (in total)