In a survey about 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

So first divide 600/15
That comes to 40.

Next we will do 12 x 40 because only 12/15 people actually agreed with the idea.
That comes to 480.

Now do 600-480
That comes to 120.

So 120 people thought it was a bad idea to make the park. But the problem asked for a percent.

120/600 = .2 or 20%