
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
A grain warehouse manager counted the total mass of 10 bags of flour, using 50 kilograms as the standard. The amount exceeding the standard is marked as positive, and the amount below the standard is marked as negative. The weighing records are as follows:  
+2, +3.5, -1, -0.5, -3, -1, +4, +1, -2, +1.5.  
(1) Which bag is closest to 50 kg?  
(2) How many kilograms heavier is the heaviest bag compared to the lightest bag?  
(3) What is the total mass of these 10 bags of flour?

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