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Datos:
x/y = 15/8
x - y = 42
piden x = ?
le ponemos una constante "k"
x = 15k ^ y = 8k
reemplazamos
x - y = 42
15k - 8k = 42
7k = 42
k = 6 ...........(I)
comprobamos
15k - 8k = 42
15(6) - 8(6) = 42
90 - 48 = 42
42 = 42
piden x = 15k
RPTA: El numero mayor es 90