Alice is at a big train station. She’s having lunch on floor 3. Her train platform is on floor .
How many floors does Alice need to go down to take her train?
The temperature at a research station in the North Pole decreases by per week. Meanwhile, another research station in the South Pole increases by per week. After 5 weeks, both research stations have the same temperature.
If the South Pole station started at , what temperature did the North Pole station start at?
Which of the following numbers is the smallest?