Number puzzle
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Can you find a five digit number that, if you place a 1 at the beginning to make a new number, is three times larger than if you place the 1 at the end instead?
x is our solution
Adding 100000 puts a 1 at the front of any 5 digit number = 100000 + x
Multiplying by 10 and adding 1 puts a 1 at the end of a number = 10x+1
Hence
3(100000 + x) = 10x+1
300000 + 3x = 10x + 1
299999 = 7x
x = 42857
The answer is 42857
142857 x 3 = 428571
Your Answer
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