<span>here is what i get :
x/3+11-(1/15)=0 </span>
W equals 14/8 is the correct answer
648-259= 389
There are 259 boys and 389 girls.
We have similar triangles so
12/x = (12+78)/(x+13)
We can skip some algebra by doing the ratio on the pieces. We'll show it works at the end.
12/x = 78/13
x = 12(13)/78 = 2
We check
12/2 = 6
(12+78)/(2+13) = 90/15 = 6, good
Answer: x=2
60(pi/180)=pi/3
.5(12^2)(pi/3)
72(pi/3)
24pi
