In an election between two candidates Pooja and Komal, 18% of voters did not cast the vote and 500 casted votes were declared invalid. Komal got 77% of the total valid votes and won by 10800 votes. Find the number of voters that did not participate in the voting.

4500

let total votes = 100%

 18% of voters did not cast the vote                         

 so Casted votes  =  82%  out of these votes 500 are invalid

          winner votes   :   looser

              (  77%        :     23% ) of 82% - 500

                      (   54%  ) of 82% - 500

54 % → 10800

100 % → 20000

Now → 82% of total = 20000 + 500

 18% of total = \(\frac{20500}{82}\) x 18

 Did not cast their votes = 4500