
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
Alice, Ben, Charlie, and David went on a trip and decided to split all costs equally. During the trip, Alice paid $120, Ben paid $150, Charlie paid $180, and David paid $210. To share costs equally, Charlie gave Alice $c$ dollars and David gave Ben $b$ dollars. What is $c-b$?
A) 25
B) 30
C) 35
D) 40
E) 45

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