What is the result of 30-12 plus 30-13?

To arrive at the answer correctly, it is important to clarify how to handle the expressions given in the question, which is structured as a mathematical operation involving subtraction and addition.

Start by simplifying the two expressions in the question:

1. The first part, 30 - 12, calculates to 18.
2. The second part, 30 - 13, calculates to 17.

Now, combine the results of these two calculations by adding them together:

18 (from 30 - 12) plus 17 (from 30 - 13) equals 35.

The understanding here comes from applying basic arithmetic operations in the correct sequence. It is essential to perform each operation step-by-step to accurately combine the results.

Even though the final calculated value is 35, this means the correct choice here would be the first option, not the third as given. Thus, it seems there may have been a misunderstanding regarding the choices provided. When working through multiple-choice math questions, be diligent about verifying each step leading to the final answer.