In an election contested between two candidates, 15% of the total voters did not cast their votes and 100 votes got disqualified. The candidate who won the election won it by securing 45% of the total votes and won by a margin of 400 votes. Find the total number of voters?

6,000

Let the total votes be 100x

valid votes = 85% of x - 100

Valid votes = 85x - 100

Winner got = 45%of x

Looser got = 45% of x - 400

According to the question,

85x - 100 = 45%of x + 45%of x - 400

85x - 100 = 45x + 45x - 400

5x = 300

x = 60

100x = 6000