Help plz i hate this but everytime I do this I get it worng

The answer is 19.25

Step-by-step explanation:

Key skills needed: Fraction operations, decimal conversion

1) We are given the hint to use 9 as "b", and we get:

--->  

Let's do  

--> is the same as ÷

16 divide by 8 is 2.

2) This means that it would be  --->  which is simply 2 times 9.

2 times 9 = 9 + 9 = 18

3) With that result, it would be  --->

Now, do (10 divided by 8)  ---> Get 1.25

4) 18 + 1.25 = 19.25, so --> is the answer

Hope you understood and have a nice day!!   :D

3 hours and 15 minutes

hope this : )