Question

Alina ,Radu si Mihai au cules inpreuna 188 de castane .Radu a cules de doua ori mai multe decat Alina si cu13 mai putine castane decat Mihai.Cate castane a cules fiecare copil.

Answer 1

A+R+M=188
R=2A=>a=R:2
R=M-13 =>M=R+13
R/2+R+R+13=188 amplificam cu 2
R+2R+2R+26=376
5R=376-26
R=350:5
R=70 castane are Radu
A=70:2=35 castane are Alina
M=70+13=83 castane are Mihai

Answer 2

Radu  are 70 castane .Alina 35 de castane. si mihai 83 de castane