The possibility of building a new city park, 12 out of 15 people thought that building the park was a good idea. there were 600 people surveyed. what percent do not think the park is a good idea?

If 12 of 15 thought it was a good idea then (15-12)=3, 3 out of 15 thought is was not a good idea...

Percent means per one hundred

p/100=3/15

p=3(100)/15=20%

So 20%, or 120 people of the 600, thought the park was not a good idea.