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2) Sea a la edad de Alicia y b la de Beto, resulta
a . . .6
--- = ---
b . . .7
b - a = 4
a = b - 4
lo que sustituido , nos deja
b - 4 . .6
------ = ---
. b . . . 7
Multiplicando cruzado
7(b - 4) = 6b
7b - 28 = 6b
b = 28
La edad de Beto es 28 y la edad de Alicia es 24