90 : 9 : 2 * 8 =

Let's solve this step by step:

1. First, we divide 90 by 9: $$90 : 9 = 10$$.
2. Then, we divide the result by 2: $$10 : 2 = 5$$.
3. Finally, we multiply the result by 8: $$5 \cdot 8 = 40$$.

Answer: 40