What is 75 of 40?

The expression "75 of 40" is not clear and does not represent any specific mathematical operation. Therefore, I cannot provide any specific information about it. However, I can explain what certain mathematical operations mean:

1. Addition: Adding 75 to 40 results in 115.
2. Subtraction: Subtracting 75 from 40 results in -35.
3. Multiplication: Multiplying 75 by 40 results in 3000.
4. Division: Dividing 75 by 40 results in 1.875.
5. Percentage: 75% of 40 is equal to 30.

If you provide further details or clarify your question, I would be happy to help.