Macy is playing a game with her brother Ty. She said she would pick a number and give clues to its identity. Also, for every number Ty guessed right, she would do two sit-ups. The clues she gave are as follows.
The number is an odd number.
The sum of the digits is 5.
The number is less than 25.

What number did Ty guess?
How many sit-ups will Maci ha e to do?