FILE No.61Unsolved
There was a hit-and-run case. The woman who was hit and lay on the road had seen the license plate of the car as it sped away.
To the person who ran to her, she said, "6918...," and died.
However, the numbers she saw may have been misread depending on the angle she saw them from.
Which other plate number could be consistent with her words?
If you get stuck, open the hints one at a time, in order.
When turned upside down, what happens to the order of the digits?
What happens to 6 and 9?
Reverse the order and also swap the digits.
Which other plate number could be consistent with her words?
Choose the answer closest to the truth.
8169
The answer is “8169.”
When turned upside down, the order of the digits reverses, and 6 and 9 swap. Turning “6918” upside down reverses the order to “8196,” and swapping 6 and 9 gives “8169.” 6918 is the number as it is. 8196 only reverses the order without swapping 6 and 9. 9168 only swaps 6 and 9.
You reverse the order and forget about 6 and 9.
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