
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
Given the operations $1 ※ 2=0.1+0.2=0.3$, $2 ※ 3=0.2+0.3+0.4=0.9$, and $5 ※ 4=0.5+0.6+0.7+0.8=2.6$, if $a ※ 15=16.5$, what is the value of $a$?

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