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  Dumb.com » Riddles» A man told his son that he would give him $1000 if he could accomplish the following task. The father gave his son ten envelopes and a thousand dollars all in one dollar bills. He told his son 'Place the money in the envelopes in such a manner that no matter what number of dollars I ask for you can give me one or more of the envelopes containing the exact amount I asked for without having to open any of the envelopes. If you can do this you will keep the $1000.' When the father asked for a sum of money the son was able to give him envelopes containing the exact amount of money asked for. How did the son distribute the money among the ten envelopes?

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Answer: The contents or the ten envelopes (in dollar bills) should be as follows: $1 24 8 16 3264 128256 489. The first nine numbers are in geometrical progression and their sum deducted from 1000 gives the contents of the tenth envelope.