I am a common factor of 40 and 56. I am a multiple of 4 and 8. I am greater than 7. What number am I?
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Highest common factor of 40 and 56: 8
Multiples of 4: 4, 8
Multiples of 8: 8
Lowest common multiple of 4 and 8: 8
The number is 8.
Answer(s): 8