
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]


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In July, a new piece of clothing was introduced to a market. On July 1st, only 3 pieces were sold, 6 pieces on the 2nd, 9 pieces on the 3rd, and 12 pieces on the 4th. After that, the daily sales volume increased by 3 pieces each day until it reached its maximum (for l days), then started to decrease by 2 pieces each day. On July 31st, exactly 3 pieces were sold.

(1) On which day in July were the most pieces of clothing sold, and what was the maximum number?

(2) According to the trend, when the total sales of this clothing in the market reaches 200 pieces, it will become popular. However, when the daily sales volume continuously decreases and falls below 20 pieces, it will no longer be popular. How many days was this clothing popular in the market? Please explain your reasoning.

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