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Answer:
Mean of City A is 3.6. Mean of City B is 4.6.
Step-by-step explanation:
To find the mean of a data set you add all the numbers in the data set and then divide your answer by how many numbers are in the data set.
Well, since you have twice as many people and twice as many walls. It would take them also 28 minutes to paint all the walls.
Hope I helped!