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Move the 3, Triple the number (Posted on 2004-03-01) Difficulty: 2 of 5
If you moved the 3 at the end of a certain large number to the beginning, it would be the same as multiplying it by 3. What is the number?

See The Solution Submitted by Gamer    
Rating: 3.2000 (5 votes)

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Solution Puzzle Solution Comment 17 of 17 |
(In reply to answer by K Sengupta)

Assume that the number is of the form pqr.....3pqr.....3......pqr3

Let u = 0.pqr.....3pqr.....3......pqr3
Or,3.pqr.....3pqr.....3......pqr3 = u+3
or, 0.3pqr.....3pqr.....3pqr......3pqr = (u+3)/10

By the given conditions, we must have:

(u+3)/10 = 3*u
or, 30*u = u+3
or, u = 3/29

Hence the number having the given property is 103,448,275,862,0689,655,172,413,793


Edited on March 21, 2008, 1:00 pm
  Posted by K Sengupta on 2008-03-21 12:59:35

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