I am a common factor of 28 and 56. I am a multiple of 4 and 7. I am greater than 10. What number am I?
Factors of 28: 1, 2, 4, 7, 14, 28
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Highest common factor of 28 and 56: 28
Multiples of 4: 4, 8, 12, 16, 20, 24, 28
Multiples of 7: 7, 14, 21, 28
Lowest common multiple of 4 and 7: 28
The number is 28.
Answer(s): 28