
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 university student drove $150$ miles to visit a friend and averaged $25$ miles per gallon using a sedan. On the return trip, the student borrowed their friend's pickup truck and averaged only $15$ miles per gallon. What was the average fuel efficiency, in miles per gallon, for the entire journey?

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