The ratio of boys to girls in the science club is 3: 5. if there are 60 girls, how many boys are there
h quicklll
if the three vertices of a rectangle are located on the points (-2,2), (3,2), and (3,7), find the point of the fourth vertex

In ratio 3:5
Lets take x1 as 3
Lets take x2 as 5
Lets take y1 as number of boys as y
Lets take y2 as number of girls as 60

x1:x2 :: y1:y2
Product of mean = Product of extremes
     x2*y1              = x1 * y2
       5*y                = 3*60
  5y  = 180
    y  = 180/5 = 36
    y2= 36

Therefore, the number of boys is 36 boys.  

Second question :
The point of 4th vertex is (-2,7)