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Three of these puzzles have more than one answer. Try to find all the possible answers for each puzzle. One of these puzzles is impossible.

1.My number is a factor of 20.It's also a factor of 30.

2.My number is a multiple of 10.It's also a factor 45.

3.My number is between 40 and 50.It is prime.

4.My number is a multiple of 4.It's a square number.It's less than 50.

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