Question: In a mixed graph, the average temperature for three cities (A, B, C) over a week is shown. If City A\'s average temperature is 30°C, City B\'s is 25°C, and City C\'s is 20°C, what is the average temperature across all three cities?
Options:
Correct Answer: 27°C
Solution:
The average temperature is (30 + 25 + 20) / 3 = 25°C.