Sally and tami have 45 stickers. tami has 8 times as many stickers as sally. how many stickers does sally have? what is the difference between the amount sally has and the amount that tami has?

X=Sally´s strickers
8x=Tami´s strickers.

We can suggest this equation:
x+8x=45
9x=45
x=45/9
x=5

Sally´s strikers=x=5
Tami´s strikers=8x=8(5)=40

Sally have 5 strikers.

Difference between the amount Sally has and the amount that Tami has=
=5-40=-35
the difference between the amount Sally has  and the amount That Tami has is -35.

The negative sign indicates that she need 35 stickers, if she want to have the same amount that her friend. 

I'm sure the answer is a