
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
Initially, one-third of the people in a room left. Half of those who remained started to sing. There were then 18 people who were not singing. Find the original number of people in the room.
A) 36
B) 48
C) 54
D) 60
E) 72

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