
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
Xiaoming, Xiaolin, and Xiaoying together solved 100 math problems. Each of them solved 60 problems. If we call the problems that only one person solved "difficult problems", the problems that two people solved "medium problems", and the problems that all three solved "easy problems", then the number of difficult problems is more than the number of easy problems by     .

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