posted by phil .
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.