Jamie and Richard are the only contestants of the election.
Jamie got 3/8 of the total votes.
Richard got = 1 - 3/8 = (8-3)/8 = 5/8 of total votes
Number of votes Richard got = 75
So 5/8 of total votes = 75
Total votes = 75 ÷ 5/8 = 75 × 8/5 = 120
Jamie got = 120 - 75 = 45 Votes