Final answer:
The other number is 18.
Step-by-step explanation:
To find the other number, we can use the fact that the greatest common factor (GCF) of the two numbers is 9. We also know that the least common multiple (LCM) of the two numbers is 54. Since one of the numbers is 27, we can use the formula:
GCF × LCM = Product of the two numbers
Substituting the known values, we get: 9 × 54 = 27 × Other number
Solving for the other number, we find: Other number = (9 × 54) / 27 = 18
Therefore, the other number is 18.