Answer:
He can spent 2 days in each city and 4 will be leftover
Step-by-step explanation:
He has 20 days, 8 cities.
8x1=8 8x2=16 8x3=24
So 2 days in 8 cities will be the maximum number of days he can be in one city without spliting the days.
Giving a total of 16 days, 4 leftover