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Edad del 2do = x+4
Edad del 3ero = x+8
PLANTEO DE LA ECAUCION
x + x+4 +x+8 = 42
x+x+x = 42-4-8
3x = 30
x =30/3
x = 10
Edad del 1ero = x = 10 años
Edad del 2do = x+4= 10+4 = 14 años
Edad del 3ero = x+8 = 10+8 = 18 años