At the top of the Tibetan mountains, the air temperature is 30 ° C below zero What temperature will the thermometer show

At the top of the Tibetan mountains, the air temperature is 30 ° C below zero What temperature will the thermometer show at its foot, if we take the height of Everest (8848 m)?

We need to multiply the number of degrees that fall by a meter as we rise, then multiply by the altitude, in this case Everest, and then just add that to the temperature at the top of the mountains:
-30+ (0.006 • 8848) = approximately 23 degrees