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Jerry +18 = tom (2)
Reemplazas (2) en (1)
Tom + jerry = 84
Jerry + 18 + jerry = 84
2jerry = 84-18
Jerry =66/2
jerry = 33
Reemplazas jery en (2)
Tom = jerry + 18
Tom = 33+18
Tom = 51
¿cual es la edad de este último?
R. 51 años