Below are six discs stacked on a peg. The object is to reassemble the discs, one by one, in the same order on another peg, using the smallest number of moves. No larger disc can be placed on a smaller disc. How many moves will it take?
Math Riddles
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I am ten years older than my sister. There was a time when I was three times older than she was, and in one year I will be twice as old as she is. What is my age now?
Riddle AnswerBooks on a Bookshelf
There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?
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A man recently bought two aeroplanes, but afterwards found that they would not answer the purpose for which he wanted them. So he sold them for $600 each, making a loss of 20 percent on one machine and a profit of 20 percent on the other. Did he make a profit on the whole transaction, or a loss? And how much?
Riddle Answer