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In familia lui Andrei se consuma multa apa plata.Tata cumpara 3 lazi cu cate 8 sticle fiecare ,ptr o luna .In prima saptamana au consumat 6 sticle ,iar in doua sapatamani 7 sticle .Cate sticle de apa au ramas pana la sfarsitull lunei?

Răspuns :

Cate sticle sunt in total?
3×8=24
Cate sticle se consuma in cele 2 sapt?
7+6=13
Care sticle au ramas?
24-13=11
8×3=24(sticle apă)
24-6=18(au ramas in prima saptamana)
18-7=11(au ramas pana la sf lunei)