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C= B+6
Entonces
C= 3A+ 6
A+B+C= 62
Sustituyendo
A+3A+3A+6= 62
7A= 62-6
A= 56/7
A= 8 ANA
Para Carmen
C= 3A+6
C=3(8)+6
C=24+6
C= 30 CARMEN
Para Betty
B=3A
B= 3(8)
B= 24 BETTY
Comprobación
A+B+C= 62
8+24+30=62
62=62