
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
A student drives $150$ miles to a city for a conference and averages $25$ miles per gallon using his sedan. For the return trip, he uses a rental car that averages only $15$ miles per gallon. What was the average gas mileage, in miles per gallon, for the entire round trip?
A) 16.5 mpg
B) 17.5 mpg
C) 18.75 mpg
D) 19.5 mpg
E) 20 mpg

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