The average temperature of 6 days is 32°C. If the temperature on first 5 of these days (in °C) was 31, 31.5, 32.5, 31 and 32, then the temperature (in °C) on the sixth day was:

Correct option is D

Let the temperature on the sixth day be x°C.
Total temperature for 6 days = 32*6 = 192.
Total temperature for first 5 days = 31 + 31.5 + 32.5 + 31 + 32 = 158.
Therefore, temperature on the sixth day = x = 192 - 158 = 34°C.
So the answer is 34