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Puzzles :: Logical Riddles

  1.  How many times can you subtract the number 5 from 25?

     


  2.  

    When John was six years old he hammered a nail into his favorite tree to mark his height. Ten years later at age sixteen, John returned to see how much higher the nail was. If the tree grew by five centimeters each year, how much higher would the nail be?

     


  3. I am four times as old as my daughter. In 20 years time I shall be twice as old as her. How old are we now?

     


  4. If a boy blows 18 bubbles, Then pops 6 eats 7 and then He pops 5 and blows 1. How many are left?

     


  5.  

    81 x 9 = 801. What must you do to make the this equation true?

     


  6.  

    How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. Iam twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put togeather. How old is the man's son?

     


  7.  A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

     


  8. Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6. What are the two numbers?

     


  9. What is the next number in the sequence? 2, 3, 5, 9, 17, _

     


  10.  What is the next number in the series? 7,645 5,764 4,576...