18+24:8.9 =

Let's solve the expression step by step:

1. First, we divide 24 by 8: $$24 : 8 = 3$$
2. Then, we multiply the result by 9: $$3 \cdot 9 = 27$$
3. Then, we add the result to 18: $$18 + 27 = 45$$

Answer: 45