The average temperature on Wednesday, Thursday and Friday was 20^o. The average temperature on Thursday, Friday and Saturday was 24^o. If the temperature on Saturday was 27^o, what was the temperature on Wednesday?

Explanation:-

Total temperature on Wednesday, Thursday and Friday was 25 * 3 = 75^o.
Total temperature on Thursday, Friday and Saturday was 24 * 3 = 72^o.
Hence, difference between the temperature on Wednesday and Saturday = 3^o.
If Saturday temperature =27^o, then
Wednesday's temperature = 27 + 3 = 30^o.