Anyone plz i'm so confused number 5

First of all there is three regions mentioned in the task but only two mentioned in the table. So let's assume that it's a mistake and we actually have just two regions.

According to the table data we can find the percentage of times spinner landed on each region:
The Light Side:
The Dark Side:

Now we can the degree measurement of each region:
The Light Side:
The Dark Side:

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats