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Sase gaini fac opt oua in 3 zile.Cate oua vor face trei gaini in noua zile?

Răspuns :

6 gaini.....................3zile
3gaini......................x zile
6supra 3 = x supra 3
x= 6×3supra 3 (3 cu 3 se simplifica)
x=6