Solution:
No. of people who voted for worse as quality of environment are 5%
No. of people who opted for somewhat worse are 18%
If half of these would have voted for worse , We would have 9% more voting for worse
So total people voting for worse would be 5+9 = 14%
Total people = 3000
14% of 3000 = ( 14 / 100 ) * 3000 = 420
Hence , No. of people = 420