
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
An arithmetic sequence consists of $150$ numbers that are each at least $20$ and at most $90$. The sum of the numbers is $9,000$. Let $L$ be the least possible value of the $40$th term and let $G$ be the greatest possible value of the $40$th term. What is the value of $G - L$?

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