
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
Mary is eight years older than her brother Derek. Fifteen years from now, Mary will be twice as old as Derek was five years ago. Find the sum of their current ages.

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