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Interesting math: How can a magician guess your age at a glance?
The magician said, "Just tell me a number and I will know the size and age of your shoes. Multiply your own shoe size (integer) by 2, add 39, then multiply 50, add 64, and finally subtract your age. " Do you know why?

Answer: If the shoe size is X and was born in Y, then: (2x+39) * 50+64-y =100x+20 14-y is the shoe.

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