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Follow the instructions for a number puzzle:
• Take the number formed by the first 3 digits of your phone number and multiply it
by 40
• Add 1 to the result
• Multiply by 500
• Add the number formed by the last 4 digits of your phone number, and then add it
again
• Subtract 500
Multiply by //

1. What is the final number?
2. How does this number puzzle work?
3. Can you invent a new number puzzle that gives a surprising result?