I'm really bad at this sort of thing and this is not homework, just curious about learning how to do this type of problem.

80 is the represented number of 25% of the people
Find the other represented number for 75% of the other people

We first need to find what number of people  1% represents, so we divide the number of people by 25:

80/25 = 3.2 people per  1%

 We now know 3.2 people makes up 1%, so all we have to do is multiply that 75% figure by 3.2:

75 x 3.2 = 240

28 minutes ago, professorvaughn said:

I'm really bad at this sort of thing and this is not homework, just curious about learning how to do this type of problem.

80 is the represented number of 25% of the people
Find the other represented number for 75% of the other people

80 = 0.25x
y = 0.75x

 

Solve for y. 

Sorry forgot to mention an important detail of the problem. So let me just rephrase the question.

80 is the average number for 25% of the people

95 is the average number overall

So I need the average number for 75% of the others so it will equate to 95

For every 100 people, the total number for 25% of them is 25 x 80 = 2000

For every 100 people the total number for all (100%) of then is 100 x 95 = 9500

Therefore the total number for 75% of the people is 9500 - 2000 = 7500

The average number for each must be 7500/75 = 100.