Alok has some picture postcards. They are less than 15 in number. When he puts them in piles of 5, there are 2 left over. When he puts them in piles of 4, there are none left. How many cards does Alok have? (NSTSE'12)

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Alok has some picture postcards. They are less than 15 in number. When he puts them in piles of 5, there are 2 left over. When he puts them in piles of 4, there are none left. How many cards does Alok have?  (NSTSE'12)