Popular Number Puzzles

Commonly asked number puzzles in all kind of interviews. Sequence number, missing number, series number problems etc.

Puzzle #1 : 10-digit Number Puzzle

Find a 10-digit number where the first digit is how many zeros in the number, the second digit is how many 1s in the number etc. until the tenth digit which is how many 9s in the number.

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Puzzle #2 : 24 from 8,8,3,3 Puzzle

How can I get the answer 24 by only using the numbers 8,8,3,3.

You can use add, subtract, multiply, divide, and parentheses.

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Puzzle #3 : The Pearl Necklace Puzzle

A pearl necklace has 33 pearls with the largest and most valuable in the middle.
Starting from one end, each successive pearl is worth $100 more than the one before (up to the middle one), but starting from the other end each pearl is worth $150 more than the one before, up to the big pearl. The whole necklace is worth $65 000.

What is the value of the middle pearl?

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Puzzle #4 : Next number in the sequnece

What number should replace the question mark to a definite rule?

147,159,174,186, ?

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Puzzle #5 : Number of brother and sister

If I had one more sister I would have twice as many sisters as brothers. If I had one more brother I would have the same number of each. How many brothers and sisters have I?

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Puzzle #6 : Odd one out?

Which number is the odd one out?

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Puzzle #7 : Speed of car?

If a car had increased its average speed for a 210 mile journey by 5 mph, the journey would have been completed in one hour less. What was the original speed of the car for the journey?

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Puzzle #8 : How long a player spent on ground?

In a game of eight players lasting for 70 minutes, six substitutes alternate with each player. This means that all players, including the substitutes, are on the pitch for the same length of time. For how long?

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For more maths puzzles click here.

2 Thoughts on “Popular Number Puzzles

  1. Jayanth on July 26, 2015 at 4:33 pm said:

    For puzzle 1: another solution is: 8000000010

    • here second digit is 8″0″00000010 is zero which should be 1 as there is one 1 , but that would make two 1′s in total which is not possible.
      hence only answer is 6210010000

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