Given:
Particular city estimates that only 2/5 of its eligible voters went to the polls.
30,000 voters were at the polls.
To find:
The number of eligible voters in the city.
Solution:
We have,
Total number of votes at the polls = 30000
Estimated eligible voters went to the polls =

Now, the number of eligible voters is



Therefore, total number of eligible voters is 12000.