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Crina si radu au. In total 234timbre.radu arr de 2 ori mai multe timbre decat crina. Cate timbre are fiecare?

Răspuns :

r+c=234
r=2c
2c+c=234
3c=234
c=234: 3
c=78
r=78*2=156
c + r = 234
r=2c
2c+c = 234
3c = 234
c = 78
r = 156