
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Originally, a square pattern consists of 10 black and 15 white square tiles arranged in a 5x5 grid. Extend this square pattern by attaching a border of black tiles around the square. How many black tiles are there in total in the extended pattern after the border is added?
- **A)** 32
- **B)** 34
- **C)** 36
- **D)** 38

Present the answer in LaTex format: \boxed{Your answer}
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