At a football stadium, 20% of the fans in attendance were teenagers. If there were 390 teenagers at the football stadium, what was the total number of people at the stadium? Insert the values given in the problem then scale up or down to find the missing value.

1950 people

Step-by-step explanation:

Find the total number of people by dividing 390 by 0.2

390/0.2

= 1950

So, the total number of people at the stadium was 1950

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8