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Chema:2x
Chelo:x
4x+2x+x=21
7x=21
x=3
Charo:12
Chema:6
Chelo:3
Charo = x = 2y = 4z
Chema = y = 2z
Chelo = z
x+y+z = 21
4z + 2z + z =21
7z = 21
z = 3
Charo = x = 2y = 4z = 12
Chema = y = 2z = 6
Chelo = z = 3
Saludos.