
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 city has established a residential water usage billing standard to make more efficient use of water resources: If a household's monthly water consumption does not exceed 15 cubic meters, the charge is 1.8 yuan per cubic meter; if it exceeds 15 cubic meters, the excess part is charged at 2.3 yuan per cubic meter, while the rest is still calculated at 1.8 yuan per cubic meter. In addition, a sewage treatment fee of 1 yuan per cubic meter is added. If a household paid a total water bill of 58.5 yuan in January, what was the household's water consumption for the month?

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