I am a common factor of 12 and 24. I am a multiple of 3 and 12. I am greater than 9. What number am I?
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Highest common factor of 12 and 24: 12
Multiples of 3: 3, 6, 9, 12
Multiples of 12: 12
Lowest common multiple of 3 and 12: 12
The number is 12.
Answer(s): 12