Question

Raul rezolva in prima saptamana 7 probleme, in a doua de 5 ori mai mult iar a Treia cat in primele doua saptamani la un love. Cate probleme a rezolvat Raul in cele 3 saptamani?

Answer 1

x= numarul total de probleme din cele 3 saptamani => 84 probleme
7+5*7+(7+5*7)=
7+35+(7+35)=
7+35+42=
42+42=84

Answer 2

7×5=35(a 2 sapt)
7+35=42(a 3 sapt)
7+35+42=84(probleme rezolvate )