FILE No.104Unsolved
There was a hit-and-run accident. The woman who was hit flew into the air, made one full rotation, and landed on the ground. She had seen the car's license plate. When people rushed to her, she said "6918..." and died.
At the moment in her spin when she was upside down, she saw the plate upside down. The digits she read as she saw them were "6918." (The digits 0, 1, 6, 8, and 9 can still be read as digits when turned upside down. 1, 0, and 8 look the same, and 6 and 9 swap.)
What is the car's real plate number?
If you get stuck, open the hints one at a time, in order.
What happens to the order of the digits when you turn the plate upside down?
What happens to 6 and 9?
Reverse the order, then swap the digits.
What is the car's real plate number?
Choose the answer closest to the truth.
8169
The answer is "8169."
Turning something upside down reverses the order of the digits and swaps 6 and 9. Reversing "6918" gives "8196," and swapping 6 and 9 gives "8169."
6918 is the number unchanged. 8196 only reverses the order without swapping 6 and 9. 9168 only swaps 6 and 9.
Because you reverse the order and forget about 6 and 9.
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