It looks like you've uploaded an image of a math worksheet or textbook. Let me go through the mathematical problems and assist you. Here's what I can help you with:

1. Problem 8 asks you to evaluate the expressions. There are four subparts, each involving fractions or mixed numbers.

2. Problem 9 also involves simplifying and calculating expressions, this time with larger fractions and mixed numbers.

3. Problem 10 is asking you to reduce fractions to their simplest form.

4. Problem 11 involves finding the natural number $n$ for which a certain fraction has certain divisibility properties.

5. Problem 12 appears to involve ratios of apples in two different baskets.

Would you like to work through one of these problems? Feel free to let me know which one you'd like assistance with!