Double Number Riddle
Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?
There is no such number. Since the question says, after shuffling, “the new number” becomes double the original, it implies that the number, if exists, MUST be a two-digit number. (Otherwise, when you shuffle digits, you will get multiple new numbers. E.g. consider the number 124. Shuffling the digits, we get 142, 214, 241, 412, and 421.) So, we can’t say “the new number” is so-and-so. It can only be “one of the new numbers”. “The new number” is possible only if it is a two-digit number, so that ‘shuffling’ gives only one new number.)
And, among the two-digit numbers, there is no such number that, when digits are reversed, results in doubling the number. The closest you can get is with 37, which, when shuffled, becomes 73, which is 1.973 times the original.
Your Answer
More puzzles to try-
Wonderland Moves
You are in a land where thirty men and two women were dressed in classic black and white dresses. They ...Read More »Globe Walker puzzle
How many points are there on the globe where, by walking one mile south, then one mile east and then ...Read More »Solve Puzzle
If the puzzle you solved before you solved the puzzle you solved after you solved the puzzle you solved before ...Read More »Tactical Math Puzzle
Find the value of \”a\” by solving the maths equation in the picture below:Read More »Holding a Bee
If I am holding a bee, what do I have in my eye?Read More »8 Travelers river crossing puzzle
We have 8 travelers: – 1 criminal, – 1 police man, – 1 mother with her 2 daughters, – 1 ...Read More »Loin and Unicorn in the Forest of Forgetfulness puzzle
One day Alice meets the Lion and the Unicorn in the Forest of Forgetfulness. She knows that the Lion lies ...Read More »Fruit in pair
Which fruit always travels in groups of two ?Read More »6 Teacher and theif puzzle
6 Teachers were going to school altogether. A chain snatcher steals a chain Telugu teacher – Donga Donga, Eng teacher ...Read More »Hot Tea
On a beautiful Sunday morning, You ordered a hot tea to your hotel room and suddenly you remember an important ...Read More »You have a flashlight and 8 batteries
You have a flashlight that takes 2 working batteries. You have 8 batteries but only 4 of them work. What ...Read More »Have Lots of eyes
What has lots of eyes, but can’t see?Read More »Who was the murderer?
A man is found dead on a Sunday morning. His wife calls the police immediately. The police question the wife ...Read More »Eleven plus two equals one
If eleven plus two equals one, what does nine plus five equal?Read More »Hidden Tiger
Find the Hidden Tiger in the given optical illusion ?Read More »THE MAGNET
This logic puzzle was published in Martin Gardner’s column in the Scientific American. You are in a room with no ...Read More »Leonardo’s Leaps (Stair Case Puzzle)
This is a classic interview puzzle asked in many interviews. Puzzle :Given N step stair, how many number of ways ...Read More »A young man walks through the forest
A young man walks through the forest. He comes to a bridge. In front of the bridge is a large ...Read More »Making bucket empty with 50% take out rate puzzle
A bucket is full of water. 50% of the water is taken from it every hour. How many hours will ...Read More »Fastens Two in One
What fastens two people yet touches only one?Read More »