On meteorstations 1, 2 and 3, located at different altitudes on the mountain slope, air temperature was simultaneously measured. The obtained values are given in the table. Arrange these meteorological stations in order of increasing their altitude above sea level (from lowest to highest). Write the resulting sequence of numbers in the answer.

Explanation:

Temperature generally decreases with increasing altitude on a mountain. Therefore, the station with the lowest temperature is likely at the highest altitude, and the station with the highest temperature is likely at the lowest altitude.

Looking at the table:

• Station 1: +5°C
• Station 2: +10°C
• Station 3: +15°C

Arranging the stations by temperature from lowest to highest (which corresponds to altitude from highest to lowest):

1. Station 1 (+5°C) - highest altitude
2. Station 2 (+10°C) - middle altitude
3. Station 3 (+15°C) - lowest altitude

To arrange them in order of increasing altitude (from lowest to highest), we reverse this order based on temperature.

The order of increasing altitude is from lowest temperature to highest temperature:

1. Station 1 (lowest temperature, highest altitude)
2. Station 2 (intermediate temperature, middle altitude)
3. Station 3 (highest temperature, lowest altitude)

Therefore, in order of increasing altitude, the stations are 1, 2, 3.

Answer: 123