
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
While observing at the geographical site, students recorded the temperature daily from April 15 to April 19 inclusive. The average temperature for these days turned out to be $17.5^{\circ}$. What was the temperature on April 19 and April 15, if it increased by $1.5^{\circ}$ each day?

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