
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
Three years ago, there were 30 trailer homes on Maple Drive with an average age of 15 years. Later, a group of brand new trailer homes was added. Today, the average age of all the trailers on Maple Drive is 12 years. If each of the new trailer homes added is now 3 years old (since they were new), how many new trailer homes were added three years ago?

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