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8 y 10 = 2 (ya que 2x4= 8 y 5x2= 10)
12 y 15 = 3 (3x4 = 12 3x5 = 15)
80 y 60 = 10 (10x8 = 80 10x6 = 60
21 y 28 = 7 y no sé (7x3= 21)