
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
The library spent 4500 yuan to purchase 300 books of 5 types: "Zhuangzi," "Confucius," "Mencius," "Laozi," and "Sunzi." Their unit prices (for one book) are 10 yuan, 20 yuan, 15 yuan, 28 yuan, and 12 yuan, respectively. The quantities of "Zhuangzi" and "Confucius" books are the same. The quantity of "Sunzi" books is 15 more than 4 times the quantity of "Laozi" books. In this batch of books, there are $\qquad$ "Sunzi" books.

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