Teaser 2565: Red and black
From The Sunday Times, 20th November 2011 [link]
I have taken 10 cards and written a different digit on each one. Some of the cards are red and the rest are black. I have placed some of the red cards in a row to form a long number. Then I have moved the last card to the front to give me a larger number. In fact this larger number divided by the original one equals a digit on one of the black cards.
What was the original number?
[teaser2565]
Jim Randell 3:53 pm on 11 February 2019 Permalink |
This puzzle is similar Enigma 1036.
Here is a Python program that solves it using a similar analysis.
Run: [ @replit ]
Solution: The original number is 230769.
So we have:
If we allow leading zeros there is a further solution:
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Frits 11:42 am on 29 October 2020 Permalink |
@Jim,
Is the phrase “some of the red cards” the reason why “n” cannot be 9?
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