1. Find a four-digit number, with four different digits, that equal to the number formed by its digits in descending order minus the number formed by its digits in ascending order.

2. The combined ages of Jim and his daughter total thirty-one. Jim is exactly thirty years older than his daughter. How old is his daughter?

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THE SOLUTION

1. 6174

2. Jim's daughter is only six months old, and Jim is thirty and a half years old.