So my math book gave me a proportion problem involving two triangles. It basically came down to this.

AC/DE = AB/DB

AC = 12 inches, AB = 22 inches, and DB = 14 inches,

So we have to solve for DE.

ok.

12/DE = 22/14

22(DE) = 168

168 ÷ 22 = 7.64

7.64 = 7 and 16/25

I am wrong.

the book says it is 7 and 7/11

i am confuzzled and need help as to how they are getting that 7/11.