Let us first find out how many votes were not for mayor Jackson. We get the answer by subtracting the votes for mayor Jackson from the total number of votes.
Total votes = 56,000 less
votes for mayor Jackson = 32,000
Votes not for mayor Jackson = 24,000
The ratio of number of votes not for mayor Jackson to the total number of votes:
24,000 : 56,000 (both the numbers are divisible by
8000 which is a common factor)
So the ratio in its lowest for is 3 : 7