Answer:
Yep!
Step-by-step explanation:
I'm not 100% sure if your first one is correct, but I know the second one is! Great job :)
Step 1
From the question;

We are required to find how many months it will take him to read 90 books
Step 2
We will use the ratio below to solve the problem.

Answer; It will take Bobby 9months to read 90 booj