Subtract 9 Units from 27 Units: Basic Arithmetic Solution

To solve this problem, we need to subtract one number from another. Here's a step-by-step approach:

• Identify the numbers: We need to subtract 9 units from 27 units.
• Set up the subtraction operation: $27 - 9$.
• Perform the subtraction: Subtracting 9 from 27 involves straightforward arithmetic:
  The operation is $27 - 9 = 18$.
• Simplify: The difference calculated is 18.

Therefore, the result of subtracting 9 units from 27 units is $18$.