Guess The Number Puzzle

Guess The Number Puzzle Solution - 7 December

I know a 5 digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number ?

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Solution
42857

Let the number be x
10x +1 = 3(100,000 + x)
=> x = 42857.