
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
Jia and Yi went to a discount store to buy goods. It is known that the number of items they bought is equal, and the unit price of each item is only 8 yuan or 9 yuan. If the total cost of the goods they bought was 172 yuan, then the number of items priced at 9 yuan is ____.

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