The plane flies at an altitude of 7 km, the temperature overboard is 20 C, the plane is going to land

The plane flies at an altitude of 7 km, the temperature overboard is 20 C, the plane is going to land, what is the temperature at the airfield?

With every kilometer of altitude, the air temperature decreases by 6 degrees.
Let’s find how many degrees the temperature at an altitude of 7 km is lower compared to the temperature on the Earth’s surface: 6 * 7 = 42 degrees.
If the temperature at an altitude of 7 km is the difference between the temperature on the surface of the Earth and 42 degrees, then the temperature on the surface of the Earth will be equal to the sum of the temperature at an altitude of 7 km and 42 degrees: (-20) + 42 = 42 – 20 = 22 (degrees).
Answer: 22 degrees.