In an election two candidates participated. 20% votes declare invalid and the winner gets 70% of the valid votes and won by 9600 votes. Find total voters in the list.

30000

Let x be total votes

   x × 80% = Valid votes

(The winner won by 40% of valid votes from the looser)

x × 80% × 40%  =  9600

  x × \(\frac{80}{100}\) × \(\frac{40}{100}\)   =  9600

x  =  30,000