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crina si radu au in total 234 de timbre.radu are de 2 ori mai multe timbre decat crina.cate timbre are fiecare?


Răspuns :

a timbrea are Crina, b timbre are Radu
a+b=234
b=2a
a+2a=234, 3a=234, a=234:3=78, b=2a=156