
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
On April 23rd, which is "World Book Day," Teacher Zhang planned to spend 180 yuan to buy some books online. Later, the bookstore had a promotion, so he bought a quarter more books than planned, which meant that the average price per book was reduced by 9 yuan. How many books did Teacher Zhang actually buy on this Book Day?

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